Portal:Astronomy/Anniversaries/January


 * 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 lands, three weeks ahead of twin rover Opportunity, and begins exploring the Red Planet
 * 14 January 2005 – The probe Huygens lands on 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