Gaze upon the lunar surface tonight, and you’ll see where astronauts, rovers, and landers stepped onto another world.
Understanding the 'undetectable' cosmos could lead to significant changes in some highly cherished theories about space-time.
Yes, the moon rotates on its axis. The moon's rate of rotation nearly matches its orbital period, which keep the same side facing Earth.
Learn how Earth’s moon formed, how its orbit affects Earth’s tides, why solar and lunar eclipses happen and the history of lunar exploration.
Read about the history and future of Earth’s sun as well as fun facts about the sun’s age, size, temperature, and phenomena like solar flares.
Astronomers have several ways to count stars, but getting a definitive answer to how many there are in a galaxy is "surprisingly difficult."
There are a few good theories for a multiverse — an infinite number of parallel universes besides our own.
In 2021 a "ring of fire" solar eclipse will appear in June, followed by a total solar eclipse in December.
Albert Einstein's theory of general relativity is based on the idea that massive objects cause a distortion in space-time, which is felt as gravity.
We look up today and see the stars divided into the same familiar shapes as our ancestors, but how did the constellations come to be?
The Western zodiac is a set of constellations defined by ancient scientists and diviners. Now, they're used to orient skywatchers, navigate without technology and inspire interest in the night sky.
NASA's Mars helicopter Ingenuity landed with the Perseverance rover on the Red Planet in Feb. 2021 as part of the agency's Mars 2020 mission.