ALT A crescent Earth (bottom) and faint grey Moon (top left) are seen together in the blackness of space in this image taken by Voyager 1 on September 18, 1977. Credit: NASA/JPL

ALT A NASA camera aboard the Deep Space Climate Observatory (DSCOVR) satellite captured a unique view of the far side of the Moon as it moved in front of the sunlit side of Earth in this image taken in July 2015 from about 1 million miles from Earth. Credit: NASA

ALT A camera aboard Artemis I took this photo of the Earth and the Moon as they appeared on Day 13 of its mission as it reached 268,563 miles away from Earth. The Orion spacecraft appears in the foreground on the left. Credit: NASA

ALT The Artemis II astronauts captured this photo of a crescent Moon (left, foreground) and Earth (right) on April 6 of this year. Seen from behind the Moon, its surface appears in sharp detail in the foreground, while Earth sits much farther away, smaller and softly lit in the background. A faint reflection in the spacecraft window is also visible, subtly overlaying the scene. Though their phases differ, both are shaped by the same sunlight, revealing the geometry of the Sun–Earth–Moon system from deep space. Credit: NASA

ALT The four members of NASA's SpaceX Crew-13 mission to the International Space Station pose together for an official crew portrait. From left are, Roscosmos cosmonaut and Mission Specialist Sergey Teteryatnikov, NASA astronauts Luke Delaney and Jessica Watkins, Pilot and Commander respectively, and CSA (Canadian Space Agency) astronaut and Mision Specialist Joshua Kutryk.

ALT Artistic concept of lunar surface technologies and infrastructure capabilities, including in-situ resource utilization oxygen production systems, surface power systems, in-space manufacturing tools, and advanced nanomaterials production. Credit: NASA

ALT Gemini XI astronaut Dick Gordon sits astride the spacecraft in an effort to attach a tether from the Agena space vehicle to the Gemini XI spacecraft. Behind him is the Earth's limb and the blackness of space. The tether was later used in an artificial gravity experiment.

ALT View of New York City and surrounding region as seen from the International Space Station on September 11, 2001. From the site of the Twin Towers a trail of smoke proceeds toward the south following the 9/11 terrorist attacks.