World Book at NASA
The work of American astronomer Edwin Powell Hubble revolutionized our understanding of the size and structure of the universe.
A galaxy is a system of stars, dust, and gas held together by gravity.
A nebula is a cloud of dust particles and gases in space.
A planet is a large, round heavenly body that orbits a star and shines with light reflected from the star.
Space exploration is our human response to curiosity about Earth, the moon, the planets, the sun and other stars, and the galaxy.
Latest Science News
Click here for Hubble science stories published prior to May 2013.
Thanks in part to the Hubble Space Telescope, we know the universe is 13.7 billion years old.
Nearly all galaxies may harbor supermassive black holes.
The Hubble Space Telescope has helped scientists determine the process of how planets are born.
The Hubble Space Telescope detected the first organic molecule discovered on a planet outside our solar system.
The Hubble Space Telescope detected a distant supernova that suggests the universe only recently began speeding up.
Hubble found three moons around dwarf planet Pluto.