Astronomer
Videos
An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers study astronomical objects, such as stars, planets, moons, co
A voting session is conducted in 2006 International Astronomical Union's general assembly for determining a new definition of a planet
Galileo Galilei is often referred to as the father of modern astronomy. Portrait by Justus Sustermans.
Johannes Kepler, one of the fathers of modern astronomy
Star
Videos
A star is a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances from Earth
Astronomer
…in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers study astronomical objects, such as stars, planets, moons, comets and galaxies, by some combination of observation and the application of astrophysical models. Examples of topics or fields…
The Sun, a G-type main-sequence star, the closest to Earth
A star-forming region in the Large Magellanic Cloud
Stars in the night sky
Spitzer Space Telescope infrared image showing a multitude of stars in the Milky Way galaxy