The last Boeing Starliner mission was extended from eight days to over nine months due to capsule issues after docking at the International Space Station.

A space robot said "goodnight" to the moon as it completed its mission, capturing the first high-definition images of a lunar sunset before it fell silent.

Venus will pass between the Earth and sun during what’s called an inferior conjunction

NASA astronauts are returning to Earth after nine months in space. Experts have said a prolonged period in space can come with changes to human physiology and psychology.

A European space telescope launched to explore the dark universe has released a trove of new data on distant galaxies

SpaceX Dragon Freedom splashed down off the coast of Florida, carrying Sunita 'Suni' Williams and Butch Wilmore along with NASA astronaut Nick Hague and Roscosmos cosmonaut Aleksandr Gorbunov.

A four-member crew, including NASA astronauts Sunita "Suni" Williams and Barry "Butch" Wilmore, left the ISS early Tuesday on a SpaceX Dragon spacecraft.

ABC News’ Stephanie Ramos spoke with astrophysicist Hakeem Oluseyi about how the bodies of astronauts Barry "Butch" Wilmore and Sunita "Suni" Williams have been changed by their time in space.

NASA astronauts Butch Wilmore and Suni Williams have officially returned to Earth after an unplanned nine months in space, here's how Boeing's Starliner mission unfolded.

Astronomers have confirmed the existence of four planets orbiting a star less than 6 light-years away with help from some of the world's most powerful telescopes.

Space industry expert Eric Ingram breaks down the journey back to earth for astronauts Sunita "Suni" Williams and Barry "Butch" Wilmore since departing the ISS.

NASA's SpaceX Crew-10 mission successfully undocked from the International Space Station and is headed back to Earth, carrying a crew that includes two astronauts whose return to Earth was delayed.

It's lights out for the first private lunar lander to pull off a fully successful moon mission

What was to be an eight-day test flight became a nine-month extended stay on the International Space Station due to issues with the Boeing Starliner.

ABC News’ Terry Moran speaks to space industry expert Eric Ingram about SpaceX’s launch of astronauts to the International Space Station to relieve two Americans whose trip was extended unexpectedly.

With the hydraulic issue that postponed the Starliner mission on Wednesday fixed, astronauts Barry "Butch" Wilmore and Sunita "Suni" Williams are one step closer to coming home. 

Many in the U.S. caught the total lunar eclipse, featuring a "blood moon."

The eclipse was visible throughout most of North and South America, as well as parts of Africa, Europe, Australia and Japan.

NASA’s Noah Petro shares the best ways to catch the eclipse and what it reveals about our closest cosmic neighbor.

The total lunar eclipse featuring a "blood moon" will appear on the evening of March 13 and into the early morning of March 14.

Capt. Theresa Claiborne, the first Black woman to fly with the U.S. Air Force, marked the end of an inspiring career with her final United Airlines flight.

Climate change could threaten the future use of satellites and significantly reduce the number of spacecraft that can safety orbit Earth, according to new research.

Former NASA astronaut Charles Camarda discusses the investigation into the recent SpaceX explosion and astronauts Sunni and Butch’s long-awaited homecoming.

The discovery of a massive crater formed by the impact of a meteorite more than 3.5 billion years ago is changing the way scientists view the history of Earth

Dr. Angela Speck, professor of astrophysics and chair of the Department of Physics and Astronomy at the University of Texas at San Antonio, tells us how to view the upcoming blood moon lunar eclipse.

Shop top-rate binoculars to watch the upcoming lunar eclipse.

Experts weigh in on whether President Donald Trump’s lofty goal of sending humans to Mars and back is feasible during his second term.

Texas startup Firefly Aerospace made history Sunday when it landed its spacecraft, Blue Ghost, on the lunar surface with a flawless touchdown.

ABC News’ Gio Benitez speaks with astronauts, physicists and a space physiologist to see if President Donald Trump’s lofty goal of sending humans to Mars and back is feasible during his second term.

Texas startup Firefly Aerospace made history Sunday when it landed its spacecraft, Blue Ghost, on the lunar surface with a flawless touchdown.

Blue Ghost landed on the moon on Sunday, becoming just the second private spacecraft ever to soft-land on the moon, according to Space.com.

Firefly's Blu Ghost lunar lander successfully touched down on the moon early Sunday morning.

Aerospace engineer Aisha Bowe joins ABC News Live to discuss the significance of Blue Origin’s all-female space crew.

The historic landing is in the works for the Blue Ghost spacecraft as it looks to touch down on the moon in less than 24 hours.

According to NASA, multi-planet lineups are visible "every few years."

Astronomer Gerard van Belle discusses the cosmic event that’ll take place on Friday night as seven planets align in a “planetary parade.”

Singer Katy Perry is scheduled to blast off on the next launch of Jeff Bezos' Blue Origin rocket, according to the space company.

Suni Williams and Butch Wilmore, whose week-long mission has stretched beyond 250 days, speak exclusively to "GMA" about their extended time aboard the International Space Station.

Elon Musk recently called for the ISS to be deorbited "as soon as possible." Experts say the station provides vital research, technological development and education

The asteroid, discovered just after Christmas and named 2024 YR4, could strike the planet in December of 2032, according to NASA's Center for Near Earth Object Studies.

The chances of an asteroid striking Earth within the next decade has more than doubled in a matter of weeks, according to NASA astronomers.

Valentine's Day could bring a dazzling display of the northern lights for stargazers in some parts of the U.S.

The asteroid, discovered just after Christmas and named 2024 YR4, could strike the planet in December 2032 as it approaches during another journey around its orbit, according to NASA.

The full moon will arrive Feb. 12, according to NASA.

Space debris from rocket bodies orbiting Earth could pose an increased threat of striking aircraft as it falls from space, according to new research.

As Elon Musk helps the Trump administration eliminate DEI, his SpaceX currently has a NASA contract to help land the first woman and first person of color on the moon.

Williams has broken the record for the most total spacewalking time by a woman, making her ninth spacewalk.

Astronomers have detected fast-repeating radio bursts from a distant "dead" galaxy that should not contain the energy to produce these types of signals.

Another display of the northern lights could be visible this weekend in several U.S. states following a severe solar storm.

Astronomers have reportedly detected fast-repeating radio bursts from a distant "dead" galaxy that should not contain the energy to produce these types of signals.