Kenneth Chang

If a problem with the launch tower is fixed, SpaceX will try to launch on Friday evening.

A gradual dimming and brightening when a star passed behind it suggested the mini-Pluto was wrapped in a thin layer of air.

The space agency is counting on Jeff Bezos’ company to deliver equipment essential to the next moon landing, only two years away.

The four astronauts made an emotional return to Houston a day after splashing down in the Pacific Ocean at the end of their 10-day lunar journey.

The astronauts — three Americans and one Canadian — captivated the world with their historic mission.

After a successful flight around the moon, the astronauts are relying on a flawed heat shield to protect them as they re-enter Earth’s atmosphere.

The crew of the NASA mission had a quiet day as they flew home toward Earth.

The NASA lunar flyby took the four crew members farther from Earth than any humans. They witnessed a solar eclipse and received praise in a call from President Trump.

The journey around the moon of three Americans and one Canadian is going into its sixth day, but it’s not too late to get caught up on it.

Ahead of a lunar flyby on Monday, the crew celebrated the astronaut Jeremy Hansen’s first spaceflight and got a special message from Charlie Duke, the Apollo 16 moonwalker.

Victor Glover, a former Navy test pilot, carefully maneuvered the Orion capsule in space around a discarded rocket stage. The demonstration is crucial for future moon landing missions.

The crew, three Americans and a Canadian, are the first humans to travel to the moon in more than 50 years. They will not land on the surface, but the mission will pave the way for future visits.

After orbiting Earth, the Orion capsule will carry the astronauts to the moon and arrive by Monday night.

Four astronauts of the Artemis II mission are preparing NASA for its next lunar landing.

Polling has consistently found that most people would prefer NASA spend money on things like monitoring climate change and averting asteroid collisions rather than human spaceflight.

The four astronauts — three Americans and one Canadian — spoke from a prelaunch quarantine ahead of their scheduled Wednesday mission.

The agency announced the more specific plans and timelines after years of suggesting it may build a lunar outpost.

A “red alert” involving the private Blue Ghost mission in lunar orbit a year ago highlights a growing number of incidents above Earth’s neighbor.

The company is seeking F.C.C. approval to test an idea to reflect sunlight to Earth at night, possibly powering solar panels. Critics say it could be bad for people and wildlife.

Jared Isaacman, the agency’s administrator, said the Artemis III mission would move to 2027 and would no longer attempt a lunar landing.