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Hubble Space Telescope
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==== Mass and size of Milky Way ==== In March 2019, observations from Hubble and data from the European Space Agency's [[Gaia (spacecraft)|Gaia]] space observatory were combined to determine that the mass of the [[Milky Way Galaxy]] is approximately 1.5 trillion times the mass of the Sun, a value intermediate between prior estimates.<ref>{{Cite journal |last1=Watkins |first1=Laura L. |last2=van der Marel |first2=Roeland P. |last3=Sohn |first3=Sangmo Tony |last4=Wyn Evans |first4=N. |date=March 12, 2019 |title=Evidence for an Intermediate-mass Milky Way from Gaia DR2 Halo Globular Cluster Motions |journal=The Astrophysical Journal |volume=873 |issue=2 |pages=118 |arxiv=1804.11348 |bibcode=2019ApJ...873..118W |doi=10.3847/1538-4357/ab089f |s2cid=85463973 |doi-access=free }}</ref>
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