Billions of years ago, an enormous space rock struck Mars and excavated a 750-mile-wide (1,200 kilometers) crater now called the Isidis impact basin. But the cosmos wasn’t done yet. Another smaller ...

For a long time, it was thought that this [technique] required telescopes in space,” says John Mather, the Nobel ...

Follow along for live updates as Artemis 2 makes its closest approach to the Moon.

Crew begins a seven-hour lunar observation as NASA returns to the moon’s neighborhood for the first time in decades.

The Cygnus NG-24 resupply mission heads to the ISS, while SpaceX and Chinese launch providers round out a busy week.

The four crew members are closer to Luna than to our home world, right on course, and viewing parts of the Moon never before seen by humans.

The crew was overcome with emotion as they nominated the name Carroll for a crater "in a bright spot on the Moon." ...

On average, a planetary nebula should remain visible for some 25,000 years before its shell of gas becomes invisible.

Our satellite is lining up to slide south of the bright red giant star Antares; catch the pair this morning in the predawn sky.

Mercury reaches greatest western elongation, standing 28° from the Sun at 7 P.M. EDT this evening. Now visible in the morning sky, the small planet glows at magnitude 0.4 and rises around 5:45 A.M.

In 1959, having determined that military test pilots would make the best astronauts, NASA began screening the records of 508 candidates. From there the group was narrowed to 110 men who went through ...

Exciting planetary action takes place this month. Venus and Uranus vie for attention and lie close to each other in late April. Jupiter offers a lot to observe through a telescope, particularly events ...