5 days ago · Astronomy is the study of objects and phenomena beyond Earth, whereas cosmology is a branch of astronomy that studies the origin of the universe and how it has …

Jan 10, 2026 · Neil deGrasse Tyson (born October 5, 1958, New York, New York, U.S.) is an American astronomer who popularized science with his books and frequent appearances on …

Astronomers have discovered all kinds of stars—from huge, brilliant red supergiants more than 100 times the Sun’s diameter to extremely dense neutron stars only about a dozen miles across.

5 days ago · Astronomers began to search for a planet in the Mars-Jupiter gap. In 1801 Italian astronomer Giuseppe Piazzi discovered a small planetlike object in the gap, which he named …

Edwin Hubble, American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as the leading observational cosmologist of …

Astronomy, science that encompasses the study of all extraterrestrial objects and phenomena. Until the invention of the telescope and the discovery of the laws of motion and gravity in the …

3 days ago · Giordano Bruno (born 1548, Nola, near Naples [Italy]—died February 17, 1600, Rome) was an Italian philosopher, astronomer, mathematician, and occultist whose theories …

Dec 19, 2025 · The European astronomers drew first on Greek astronomy, as translated from Arabic, before acquiring direct access to the classics of Greek science. Thus, modern …

5 days ago · After the U.S. Congress had authorized its construction in 1977, the Hubble Space Telescope (HST) was built under the supervision of the National Aeronautics and Space …

Allan Sandage (born June 18, 1926, Iowa City, Iowa, U.S.—died November 13, 2010, San Gabriel, California) was an American astronomer who led an extensive effort to determine …