List of the most distant astronomical objects

This article lists the most distant astronomical objects discovered and verified so far, and the time periods in which they were so classified.

MoM-z14 has been determined to be at a redshift of 14.44, making it the record-holder for the most distant known galaxy as of May 2025.^[1] This corresponds to a time less than 280 million years after the Big Bang.

For comparisons with the years after the Big Bang of the astronomical objects listed below, the age of the universe is currently estimated as 13.787 ± 0.020 billion years.^[2] However, the estimated age of the universe has increased over the years as the observational techniques have been refined. For the discovery of IOK-1 in 2006 had an estimate of 13.66 billion years for the age of the universe.^[3]

Distances to remote objects, other than those in nearby galaxies, are nearly always inferred by measuring the cosmological redshift of their light. By their nature, very distant objects tend to be very faint, and these distance determinations are difficult and subject to errors. An important distinction is whether the distance is determined via spectroscopy or using a photometric redshift technique. The former is generally both more precise and also more reliable, in the sense that photometric redshifts are more prone to being wrong due to confusion with lower redshift sources that may have unusual spectra. For that reason, a spectroscopic redshift is conventionally regarded as being necessary for an object's distance to be considered definitely known, whereas photometrically determined redshifts identify "candidate" very distant sources. Here, this distinction is indicated by a "p" subscript for photometric redshifts. Apart from most commonly used distance measurements for high redshift objects, an alternative is to calculate how old the object is in relation to the Big Bang and the column "Years after the Big Bang" shows these values.^[4]

Most distant spectroscopically-confirmed objects

Most distant astronomical objects with spectroscopic redshift determinations

Image	Name	Redshift (z)	Years after the Big Bang (millions)	Type	Notes
	MoM-z14	z = 14.44+0.02 −0.02	280[5]	Galaxy	Luminous Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec.[1]
	JADES-GS-z14-0	z = 14.1796+0.0007 −0.0007	290[6]	Galaxy	The detection of [OIII]88μm line emission with a significance of 6.67σ and at a frequency of 223.524 GHz, corresponding to a redshift of 14.1796±0.0007, using ALMA.[7]
	JADES-GS-z14-1	z = 13.90+0.17 −0.17	300[8]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec.[9]
	JADES-GS-z13-0	z = 13.20+0.04 −0.07	330[10]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec.[11]
	UNCOVER-z13	z = 13.079+0.014 −0.001	330[12]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec.[13]
	JADES-GS-z13-1	z = 13.0	330[14]	Galaxy	Lyman-alpha emitter, discovered by JWST in 2025.[15]
	JADES-GS-z12-0	z = 12.63+0.24 −0.08	350[16]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRCam [11] and JWST/NIRSpec,[17] and CIII] line emission with JWST/NIRSpec.[17]
	UNCOVER-z12	z = 12.393+0.004 −0.001	350[18]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec.[13]
	GLASS-z12 (GHZ2)	z = 12.3327+0.0035 −0.0035	367[19]	Galaxy	Detection of the rest-frame 88 μm atomic transition from doubly ionized oxygen using ALMA.[20]
	UDFj-39546284	z = 11.58+0.05 −0.05	380[21]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec.[11]
	CEERS J141946.36+525632.8 (Maisie's Galaxy)	z = 11.44+0.09 −0.08	390[22]	Galaxy	Lyman-break galaxy discovered by JWST.[23]
	CEERS2-588	z = 11.04	410[24]	Galaxy	Lyman-break galaxy discovered by JWST.[25]
	GN-z11	z = 10.6034 ± 0.0013	430[26]	Galaxy	Lyman-break galaxy; detection of the Lyman break with HST at 5.5σ[27] and carbon emission lines with Keck/MOSFIRE at 5.3σ.[28] Conclusive redshift by JWST in February 2023[17]
	JADES-GS-z10-0 (UDFj-38116243)[29]	z = 10.38+0.07 −0.06	450[30]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec[11]
	JD1	z = 9.793±0.002	480[31]	Galaxy	Lyman-break galaxy, detection of the Lyman break with JWST/NIRSpec[32]
	Gz9p3	z = 9.3127 ± 0.0002	510[33]	Galaxy	A galaxy merger with a redshift estimated from [OII], Ne and H emission lines detected with JWST.[33]
	MACS1149-JD1	z = 9.1096±0.0006	500[34]	Galaxy	Detection of hydrogen emission line with the VLT, and oxygen line with ALMA[35]
	EGSY8p7 (CEERS_1019)	z = 8.683+0.001 −0.004	570 [36]	Galaxy	Lyman-alpha emitter; detection of Lyman-alpha with Keck/MOSFIRE at 7.5σ confidence[37]
	SMACS-4590	z = 8.496		Galaxy	Detection of hydrogen, oxygen, and neon emission lines with JWST/NIRSpec[38][39][40][41]
	A2744 YD4	z = 8.38	600[42]	Galaxy	Lyman-alpha and [O III] emission detected with ALMA at 4.0σ confidence[43]
	MACS0416 Y1	z = 8.3118±0.0003	600[44]	Galaxy	[O III] emission detected with ALMA at 6.3σ confidence[45]
	GRB 090423	z = 8.23+0.06 −0.07	630[46]	Gamma-ray burst	Lyman-alpha break detected[47]
	RXJ2129-11002	z = 8.16±0.01	613[48]	Galaxy	[O III] doublet, Hβ, and [O II] doublet as well as Lyman-alpha break detected with JWST/NIRSpec prism.[49]
	RXJ2129-11022	z = 8.15±0.01		Galaxy	[O III] doublet and Hβ as well as Lyman-alpha break detected with JWST/NIRSpec prism.[49]
	EGS-zs8-1	z = 7.7302±0.0006	670[50]	Galaxy	Lyman-break galaxy[51]
	SMACS-0723-6355	z = 7.665		Galaxy	Detection of hydrogen, oxygen, and neon emission lines with JWST/NIRSpec[38][39][40][41]
	z7_GSD_3811	z = 7.6637±0.0011		Galaxy	Lyman-alpha emitter[52]
	SMACS-0723-10612	z = 7.658		Galaxy	Detection of hydrogen, oxygen, and neon emission lines with JWST/NIRSpec[38][39][40]>[41]
	QSO J0313–1806	z = 7.6423±0.0013	670[53]	Quasar	Lyman-alpha break detected[54]
	ULAS J1342+0928	z = 7.5413±0.0007	690[55]	Quasar	Redshift estimated from [C II] emission[56]
	z8_GND_5296	z = 7.51	700[57]	Galaxy	Lyman-alpha emitter[58]
	A1689-zD1	z = 7.5±0.2	700[59]	Galaxy	Lyman-break galaxy[60]
	GS2_1406	z = 7.452±0.003		Galaxy	Lyman-alpha emitter[61]
	GN-108036	z = 7.213	750[62]	Galaxy	Lyman alpha emitter[63]
	SXDF-NB1006-2	z = 7.2120±0.0003	800[64]	Galaxy	[O III] emission detected[65]
	BDF-3299	z = 7.109±0.002	800[66]	Galaxy	Lyman-break galaxy[67]
	ULAS J1120+0641	z = 7.085±0.003	770[68]	Quasar	Redshift estimated from Si III]+C III] and Mg II emission lines[69]
	A1703 zD6	z = 7.045±0.004		Galaxy	Gravitationally-lensed Lyman-alpha emitter[70]
	BDF-521	z = 7.008±0.002		Galaxy	Lyman-break galaxy[67]
	IOK-1	z = 6.965	780[71]	Galaxy	Lyman-alpha emitter[63]
	GDS_1408 (G2_1408)	z = 6.82±0.1		Galaxy	Lyman-alpha emitter and VLT spectroscopy.[72]

Candidate most distant objects

Since the beginning of the James Webb Space Telescope's (JWST) science operations in June 2022, numerous distant galaxies far beyond what could be seen by the Hubble Space Telescope (z = 11) have been discovered thanks to the JWST's capability of seeing far into the infrared.^[73][74]

Previously in 2012, there were about 50 possible objects z = 8 or farther, and another 100 candidates at z = 7, based on photometric redshift estimates released by the Hubble eXtreme Deep Field (XDF) project from observations made between mid-2002 and December 2012.^[75]

Some objects included here have been observed spectroscopically, but had only one emission line tentatively detected, and are therefore still considered candidates by researchers.^[76]

Notable candidates for most distant astronomical objects

Name	Redshift (z)	Type	Notes
Capotauro	z ∼ 32	Galaxy	A spectro-photometric analysis of JWST/NIRCam, MIRI, and NIRSpec/MSA data with HST/ACS and WFC3 observations.[77]
MIDIS-z25-3	zp = 25.6+1.5 −1.6	Galaxy	A selection based on photometry, photometric redshift probability distributions and visual inspection, based on the JWST/NIRCam data provided by the MIRI Deep Imaging Survey (MIDIS).[78]
F200DB-045	zp = 20.4+0.3 −0.3[74] or 0.70+0.19 −0.55[73] or 0.40+0.15 −0.26[79]	Galaxy	Lyman-break galaxy discovered by JWST[74] NOTE: The redshift value of the galaxy presented by the procedure in one study[73] may differ from the values presented in other studies using different procedures.[74][80][79]
GLIMPSE 70467	zp = 16.4+1.8 −1.8	Galaxy	Lyman-break selection and photometry[81]
F200DB-175	zp = 16.2+0.3 −0.0	Galaxy	Lyman-break galaxy discovered by JWST[74]
S5-z17-1	z = 16.0089±0.0004 or 4.6108±0.0001	Galaxy	Lyman-break galaxy discovered by JWST; tentative (5.1σ) ALMA detection of a single emission line possibly attributed to either [C II] (z = 4.6108±0.0001) or [O III] (z = 16.0089±0.0004).[76][82]
F150DB-041	zp = 16.0+0.2 −0.2[74] or 3.70+0.02 −0.59[73]	Galaxy	Lyman-break galaxy discovered by JWST[74][73]
SMACS-z16a	zp = 15.92+0.17 −0.15[83] or 2.96+0.73 −0.21[73]	Galaxy	Lyman-break galaxy discovered by JWST[83][73]
F200DB-015	zp = 15.8+3.4 −0.1	Galaxy	Lyman-break galaxy discovered by JWST[74]
F200DB-181	zp = 15.8+0.5 −0.3	Galaxy	Lyman-break galaxy discovered by JWST[74]
F200DB-159	zp = 15.8+4.0 −15.2	Galaxy	Lyman-break galaxy discovered by JWST[74]
GLIMPSE 72839	zp = 15.8+0.8 −0.8	Galaxy	Lyman-break selection and photometry[81]
F200DB-086	zp = 15.4+0.6 −14.6[74] or 3.53+10.28 −1.84[73]	Galaxy	Lyman-break galaxy discovered by JWST[74][73]
SMACS-z16b	zp = 15.32+0.16 −0.13[83] or 15.39+0.18 −0.26[73]	Galaxy	Lyman-break galaxy discovered by JWST[83][73]
F150DB-048	zp = 15.0+0.2 −0.8	Galaxy	Lyman-break galaxy discovered by JWST[74]
F150DB-007	zp = 14.6+0.4 −0.4	Galaxy	Lyman-break galaxy discovered by JWST[74]

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by editing the page to add missing items, with references to reliable sources.

List of most distant objects by type

Most distant object by type

Type	Object	Redshift (distance)	Notes
Any astronomical object, no matter what type	MoM-z14	z = 14.4	This is a galaxy discovered by JWST-based "Mirage or Miracle" (MoM) survey. [84][85]
Galaxy cluster	CL J1001+0220	z ≅ 2.506	As of 2016[86] See also: List of galaxy clusters
Galaxy supercluster	Hyperion proto-supercluster	z = 2.45	This supercluster at the time of its discovery in 2018 was the earliest and largest proto-supercluster found to date.[87] See also: List of superclusters
Galaxy protocluster	A2744z7p9OD	z = 7.88	This protocluster at the time of its discovery in 2023 was the most distant protocluster found and spectroscopically confirmed to date.[88] See also: List of galaxy groups and clusters
Galaxy or protogalaxy	MoM-z14	z = 14.4	[84]
Quasar	UHZ1	z ≅ 10.0	[89] See also: List of quasars
Black hole	GN-z11	z = 10.6034±0.0013[90]	[91][92][93]
Star or protostar or post-stellar corpse (detected by an event)	Progenitor of GRB 090423	z = 8.26+0.07 −0.08	[94][47] Note, GRB 090429B has a photometric redshift zp≅9.4,[95] and so is most likely more distant than GRB 090423, but is lacking spectroscopic confirmation. Estimated an approximate distance of 13 billion lightyears from Earth. See also: List of gamma-ray bursts
Star or protostar or post-stellar corpse (detected as a star)	WHL0137-LS (Earendel)	z = 6.2 ± 0.1 (12.9 Gly)	Most distant individual star detected when discovered March 2022.[96][97] Previous records include SDSS J1229+1122[98] and MACS J1149 Lensed Star 1.[99] See also: List of most distant stars
Star cluster	The Sparkler	z = 1.378 (13.9 Gly)	Galaxy with globular clusters gravitationally lensed in SMACS J0723.3-7327[100]
System of star clusters
X-ray jet	PJ352–15 quasar jet	z = 5.831 (12.7 Gly)[101]	The previous recordholder was at 12.4 Gly.[102][103]
Microquasar	XMMU J004243.6+412519	(2.5 Mly)	First extragalactic microquasar discovered[104][105][106]
Nebula-like object	Himiko	z = 6.595	Possibly one of the largest objects in the early universe.[107][108]
Magnetic field	9io9	z = 2.554 (11.1 Gly)	Observations from ALMA has shown that the lensed galaxy 9io9 contains a magnetic field.
Planet	SWEEPS-11 / SWEEPS-04	(27,710 ly)	[109] An analysis of the lightcurve of the microlensing event PA-99-N2 suggests the presence of a planet orbiting a star in the Andromeda Galaxy.[110] A controversial microlensing event of lobe A of the double gravitationally lensed Q0957+561 suggests that there is a planet in the lensing galaxy lying at redshift 0.355 (3.7 Gly).[111][112]

Most distant event by type

Type	Event	Redshift	Notes
Gamma-ray burst	GRB 090423	z = 8.26+0.07 −0.08	[94][47] Note, GRB 090429B has a photometric redshift zp≅9.4,[95] and so is most likely more distant than GRB 090423, but is lacking spectroscopic confirmation. See also: List of gamma-ray bursts
Core collapse supernova	SN 1000+0216	z = 3.8993	[113] See also: List of most distant supernovae
Type Ia supernova	SN UDS10Wil	z = 1.914	[114] See also: List of supernovae

Timeline of most distant astronomical object recordholders

Objects in this list were found to be the most distant object at the time of determination of their distance. This is frequently not the same as the date of their discovery.

Distances to astronomical objects may be determined through parallax measurements, use of standard references such as cepheid variables or Type Ia supernovas, or redshift measurement. Spectroscopic redshift measurement is preferred, while photometric redshift measurement is also used to identify candidate high redshift sources. The symbol z represents redshift.

Most distant object titleholders (not including candidates based on photometric redshifts)

Object	Type	Date	Distance (z = Redshift)	Notes
MoM-z14	Galaxy	2025–present	z = 14.44	[84][85]
JADES-GS-z14-0	Galaxy	2024–2025	z = 14.32	[115][84]
JADES-GS-z13-0	Galaxy	2022–2024	z = 13.20	[11][115]
GN-z11	Galaxy	2016–2022	z = 10.6	[27][28][84]
EGSY8p7	Galaxy	2015−2016	z = 8.68	[116][117][118][119]
Progenitor of GRB 090423 / Remnant of GRB 090423	Gamma-ray burst progenitor / Gamma-ray burst remnant	2009–2015	z = 8.2	[47][120]
IOK-1	Galaxy	2006 − 2009	z = 6.96	[120][121][122][123]
SDF J132522.3+273520	Galaxy	2005 − 2006	z = 6.597	[123][124]
SDF J132418.3+271455	Galaxy	2003 − 2005	z = 6.578	[124][125][126][127]
HCM-6A	Galaxy	2002 − 2003	z = 6.56	The galaxy is lensed by galaxy cluster Abell 370. This was the first non-quasar galaxy found to exceed redshift 6. It exceeded the redshift of quasar SDSSp J103027.10+052455.0 of z = 6.28[125][126][128][129][130][131]
SDSS J1030+0524 (SDSSp J103027.10+052455.0)	Quasar	2001 − 2002	z = 6.28	[132][133][134][135][136][137]
SDSS 1044–0125 (SDSSp J104433.04–012502.2)	Quasar	2000 − 2001	z = 5.82	[138][139][136][137][140][141][142]
SSA22-HCM1	Galaxy	1999–2000	z>=5.74	[139][143]
HDF 4-473.0	Galaxy	1998–1999	z = 5.60	[143]
RD1 (0140+326 RD1)	Galaxy	1998	z = 5.34	[144][145][146][143][147]
CL 1358+62 G1 & CL 1358+62 G2	Galaxies	1997 − 1998	z = 4.92	These were the most remote objects discovered at the time. The pair of galaxies were found lensed by galaxy cluster CL1358+62 (z = 0.33). This was the first time since 1964 that something other than a quasar held the record for being the most distant object in the universe.[145][148][149][146][143][150]
PC 1247–3406	Quasar	1991 − 1997	z = 4.897	[151][138][152][153][154][155]
PC 1158+4635	Quasar	1989 − 1991	z = 4.73	[138][155][156][157][158][159]
Q0051–279	Quasar	1987 − 1989	z = 4.43	[160][156][159][161][162][163]
Q0000–26 (QSO B0000–26)	Quasar	1987	z = 4.11	[160][156][164]
PC 0910+5625 (QSO B0910+5625)	Quasar	1987	z = 4.04	This was the second quasar discovered with a redshift over 4.[138][156][165][166]
Q0046–293 (QSO J0048–2903)	Quasar	1987	z = 4.01	[160][156][165][167][168]
Q1208+1011 (QSO B1208+1011)	Quasar	1986 − 1987	z = 3.80	This is a gravitationally-lensed double-image quasar, and at the time of discovery to 1991, had the least angular separation between images, 0.45″.[165][169][170]
PKS 2000-330 (QSO J2003–3251, Q2000–330)	Quasar	1982 − 1986	z = 3.78	[165][171][172]
OQ172 (QSO B1442+101)	Quasar	1974 − 1982	z = 3.53	[173][174][175]
OH471 (QSO B0642+449)	Quasar	1973 − 1974	z = 3.408	Nickname was "the blaze marking the edge of the universe".[173][175][176][177][178]
4C 05.34	Quasar	1970 − 1973	z = 2.877	Its redshift was so much greater than the previous record that it was believed to be erroneous, or spurious.[175][179][180][181]
5C 02.56 (7C 105517.75+495540.95)	Quasar	1968 − 1970	z = 2.399	[150][181][182]
4C 25.05 (4C 25.5)	Quasar	1968	z = 2.358	[150][181][183]
PKS 0237–23 (QSO B0237–2321)	Quasar	1967 − 1968	z = 2.225	[179][183][184][185][186]
4C 12.39 (Q1116+12, PKS 1116+12)	Quasar	1966 − 1967	z = 2.1291	[150][186][187][188]
4C 01.02 (Q0106+01, PKS 0106+1)	Quasar	1965 − 1966	z = 2.0990	[150][186][187][189]
3C 9	Quasar	1965	z = 2.018	[186][190][191][192][193][194]
3C 147	Quasar	1964 − 1965	z = 0.545	[195][196][197][198]
3C 295	Radio galaxy	1960 − 1964	z = 0.461	[143][150][199][200][201]
LEDA 25177 (MCG+01-23-008)	Brightest cluster galaxy	1951 − 1960	z = 0.2 (V = 61000 km/s)	This galaxy lies in the Hydra Supercluster. It is located at B1950.0 08h 55m 4s +03° 21′ and is the BCG of the fainter Hydra Cluster Cl 0855+0321 (ACO 732).[143][201][202][203][204][205][206]
LEDA 51975 (MCG+05-34-069)	Brightest cluster galaxy	1936 –	z = 0.13 (V = 39000 km/s)	The brightest cluster galaxy of the Bootes Cluster (ACO 1930), an elliptical galaxy at B1950.0 14h 30m 6s +31° 46′ apparent magnitude 17.8, was found by Milton L. Humason in 1936 to have a 40,000 km/s recessional redshift velocity.[205][207][208]
LEDA 20221 (MCG+06-16-021)	Brightest cluster galaxy	1932 –	z = 0.075 (V = 23000 km/s)	This is the BCG of the Gemini Cluster (ACO 568) and was located at B1950.0 07h 05m 0s +35° 04′[207][209]
BCG of WMH Christie's Leo Cluster	Brightest cluster galaxy	1931 − 1932	z = (V = 19700 km/s)	[209][210][211][212]
BCG of Baede's Ursa Major Cluster	Brightest cluster galaxy	1930 − 1931	z = (V = 11700 km/s)	[212][213]
NGC 4860	Galaxy	1929 − 1930	z = 0.026 (V = 7800 km/s)	[213][214][215]
NGC 7619	Galaxy	1929	z = 0.012 (V = 3779 km/s)	Using redshift measurements, NGC 7619 was the highest at the time of measurement. At the time of announcement, it was not yet accepted as a general guide to distance, however, later in the year, Edwin Hubble described redshift in relation to distance, which became accepted widely as an inferred distance.[214][216][217]
NGC 584 (Dreyer nebula 584)	Galaxy	1921 − 1929	z = 0.006 (V = 1800 km/s)	At the time, nebula had yet to be accepted as independent galaxies. However, in 1923, galaxies were generally recognized as external to the Milky Way.[205][214][216][218][219][220][221]
M104 (NGC 4594)	Galaxy	1913 − 1921	z = 0.004 (V = 1180 km/s)	This was the second galaxy whose redshift was determined; the first being Andromeda – which is approaching us and thus cannot have its redshift used to infer distance. Both were measured by Vesto Melvin Slipher. At this time, nebula had yet to be accepted as independent galaxies. NGC 4594 was measured originally as 1000 km/s, then refined to 1100, and then to 1180 in 1916.[214][218][221]
Arcturus (Alpha Bootis)	Star	1891 − 1910	160 ly (18 mas) (this is very inaccurate, true=37 ly)	This number is wrong; originally announced in 1891, the figure was corrected in 1910 to 40 ly (60 mas). From 1891 to 1910, it had been thought this was the star with the smallest known parallax, hence the most distant star whose distance was known. Prior to 1891, Arcturus had previously been recorded of having a parallax of 127 mas.[222][223][224][225]
Capella (Alpha Aurigae)	Star	1849–1891	72 ly (46 mas)	[226][227][228]
Polaris (Alpha Ursae Minoris)	Star	1847 – 1849	50 ly (80 mas) (this is very inaccurate, true=~440 ly)	[229][230]
Vega (Alpha Lyrae)	Star (part of a double star pair)	1839 – 1847	7.77 pc (125 mas)	[229]
61 Cygni	Binary star	1838 − 1839	3.48 pc (313.6 mas)	This was the first star other than the Sun to have its distance measured.[229][231][232]
Uranus	Planet of the Solar System	1781 − 1838	18 AU	This was the last planet discovered before the first successful measurement of stellar parallax. It had been determined that the stars were much farther away than the planets.
Saturn	Planet of the Solar System	1619 − 1781	10 AU	From Kepler's Third Law, it was finally determined that Saturn is indeed the outermost of the classical planets, and its distance derived. It had only previously been conjectured to be the outermost, due to it having the longest orbital period, and slowest orbital motion. It had been determined that the stars were much farther away than the planets.
Mars	Planet of the Solar System	1609 − 1619	2.6 AU when Mars is diametrically opposed to Earth	Kepler correctly characterized Mars and Earth's orbits in the publication Astronomia nova. It had been conjectured that the fixed stars were much farther away than the planets.
Sun	Star	3rd century BC — 1609	380 Earth radii (very inaccurate, true=16000 Earth radii)	Aristarchus of Samos made a measurement of the distance of the Sun from the Earth in relation to the distance of the Moon from the Earth. The distance to the Moon was described in Earth radii (20, also inaccurate). The diameter of the Earth had been calculated previously. At the time, it was assumed that some of the planets were further away, but their distances could not be measured. The order of the planets was conjecture until Kepler determined the distances from the Sun of the five known planets that were not Earth. It had been conjectured that the fixed stars were much farther away than the planets.
Moon	Moon of a planet	3rd century BC	20 Earth radii (very inaccurate, true=64 Earth radii)	Aristarchus of Samos made a measurement of the distance between the Earth and the Moon. The diameter of the Earth had been calculated previously.
z represents redshift, a measure of recessional velocity and inferred distance due to cosmological expansion mas represents parallax, a measure of angle and distance can be determined through trigonometry

See also

• Age of the universe
• List of largest cosmic structures
• List of exoplanet extremes
• Lists of astronomical objects
• List of most distant stars
• Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure