Aries Constellation: Facts About the Ram By Kim Ann Zimmermann This dim constellation wasn't defined until 1930.
NASA's Stardust Mission: The Space Probe That Brought Stardust to Earth By Nola Taylor Redd Over the course of 11 years, Stardust visited an asteroid and two comets and sent pieces of space matter back to Earth.
Gemini Constellation: Facts About the Twins By Kim Ann Zimmermann The constellation Gemini is easy to spot in the northeastern sky.
TESS: NASA's Search for Earth-Like Planets By Elizabeth Howell Will TESS be the mission that discovers another Earth?
NASA's New Millennium Program: Taking Risks to Reduce Future Danger By Nola Taylor Redd The New Millennium Program explored new technology in space to reduce mission costs.
NASA's STEREO Mission: A Quest to Learn More About the Sun By Nola Taylor Redd Although one of the twin spacecraft is no longer in contact with Earth, NASA's STEREO mission continues to provide insights about the sun.
Terrestrial Planets: Definition & Facts About the Inner Planets By Katharine Gammon Rocky surfaces and molten cores are what the four inner planets of the solar system have in common
How Old Is Earth? By Nola Taylor Redd Scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years.
Mars: What We Know About the Red Planet By Charles Q. Choi Learn about planet Mars’ atmosphere, water supply and the possibility to support life, plus, findings from the Mars exploration rover mission.
Ariane 5: European Heavy-Lift Rocket By Elizabeth Howell Ariane 5 is a European heavy-lift rocket that takes satellites and other payloads into Earth orbit.
Deep Impact: The Deep-Space Comet Hunter By Nola Taylor Redd NASA's Deep Impact mission was the most-traveled deep-space comet hunter of its time.
China's Chang'e Program: Missions to the Moon By Adam Mann China's many missions to explore the red moon.
Columbia Disaster: What happened and what NASA learned By Elizabeth Howell The space shuttle Columbia broke up on Feb. 1, 2003, killing its seven-member crew. An investigation led to changes in NASA procedures.
Dawn Mission: Shedding Light on Asteroids By Nola Taylor Redd The Dawn spacecraft broke several records when it visited Vesta and Ceres in the asteroid belt.
GRAIL: NASA's Mission to Study the Gravity of the Moon By Nola Taylor Redd Before their fiery demise, NASA's twin GRAIL spacecraft mapped the moon in a quest to learn more about our closest neighbor.
What Is a Blood Moon? By Elizabeth Howell 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.
Deep Space 1: Providing a Wealth of New Space Technology By Nola Taylor Redd 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.
