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

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

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

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

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

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.

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

The countdown has begun. The crew is ready. And barring any last-minute hiccups, four astronauts on Wednesday will begin a journey that sends them farther from Earth than any human has gone before.

Mercury reaches greatest western elongation at 7 P.M. EDT this evening, standing 28° from the Sun. However, the planet is only currently visible in the predawn sky. You can catch it in the east ...

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 ...