Rocky surfaces and molten cores are what the four inner planets of the solar system have in common
Scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years.
Learn about planet Mars’ atmosphere, water supply and the possibility to support life, plus, findings from the Mars exploration rover mission.
The space shuttle Columbia broke up on Feb. 1, 2003, killing its seven-member crew. An investigation led to changes in NASA procedures.
Before their fiery demise, NASA's twin GRAIL spacecraft mapped the moon in a quest to learn more about our closest neighbor.
If the rays of the setting or rising sun hit the moon just right, the moon appears to turn red or ruddy-brown. This is called a blood moon.
The primary mission for NASA's Deep Space 1 was to test out a dozen new advanced technologies. During the spacecraft's ride through space, it also swung by an asteroid and a comet.
This Virgin Galactic spin-off aims to launch hundreds of small satellites into space at once, aboard their large LauncherOne rocket.
The small asteroid that broke up over the city of Chelyabinsk, Russia, on Feb. 15, 2013, was a reminder about the importance of monitoring small bodies in space that could pose a threat to Earth.
Elliptical galaxies are dim collections of older stars, so they don't shine as brightly as spiral galaxies but they're the most common type of galaxies in the universe.
NASA's Phoenix Mars Lander was a recycled spacecraft that became the first spacecraft to sample water on Mars.
Comet ISON, discovered by two amateur astronomers in Russia, arrived in Earth's neighborhood in November 2013 and apparently broke up as it rounded the sun.