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1 January 1925 – Astronomer Edwin Hubble formally presents his discovery of galaxies outside the Milky Way at a meeting of the American Astronomical Society
1 January 1952 – The Kyiv Planetarium opens in Kyiv , Ukraine
3 January 1888 – The 91-centimeter refracting telescope at Lick Observatory , the world's largest telescope from 1888 to 1897, sees its first light
3 January 1999 – The Mars Polar Lander is launched by NASA to study the soil and climate of Planum Australe , a region near the south pole on Mars
4 January 2004 – The Mars rover Spirit Opportunity
14 January 2005 – The probe Huygens Titan , a moon of Saturn , in the first successful landing in the outer Solar System
26 January 1949 – Hale Telescope , which introduced several innovations to telescope construction and was the world's largest telescope for nearly 30 years, has its first light
