The CHIME radio telescope aims to explain two poorly understood cosmic phenomena, one dating back to the early universe and one taking place today.
IBEX is helping astronomers figure out where the edge of our solar system ends and the rest of space begins.
Over the course of 11 years, Stardust visited an asteroid and two comets and sent pieces of space matter back to Earth.
Although one of the twin spacecraft is no longer in contact with Earth, NASA's STEREO mission continues to provide insights about the sun.
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.