Our understanding about the universe and our place in it has changed over time.
Less than a year from now, NASA's New Horizons spacecraft will make the first-ever visit to Pluto, potentially revolutionizing scientists' understanding of the dwarf planet.
Apollo 11 was four minutes into its landing sequence when the terse words of its commander, Neil Armstrong, came from the speaker in Mission Control: "Program alarm."
When American astronauts make the next "giant leap" by launching to Mars, they will bring with them a memento from the first moon landing 45 years ago.
Under its icy crust, Jupiter's moon Europa could harbor a vast ocean of potentially life-supporting liquid water, and NASA has issued a call for proposals for science instruments for mission that...
The International Space Station accepted a fresh delivery of goods Wednesday.
It has been almost 45 years since an estimated 600 million people on Earth watched Apollo 11 crew members Neil Armstrong and Buzz Aldrin take their iconic first steps on the moon.
Researchers have figured out a new way to predict which rivers are most at risk of dangerous flooding.
NASA has launched its first spacecraft devoted to monitoring atmospheric carbon dioxide, the heat-trapping gas thought to be responsible for much of Earth's recent warming trend.
The planned launch of a rocket carrying a NASA satellite designed to track global warming has been postponed.