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This artist's concept shows an astronaut on Mars, as viewed through the window of a spacecraft.

 

Seen here in incredible detail is the starburst galaxy formally known as PLCK G045.1+61.1. The galaxy, which appears as multiple reddish dots near the center of the image, is being gravitationally lensed by a cluster of closer galaxies, also seen in the image.

 

Launched on April 20, 2004, Gravity Probe B (GP-B) was a collaboration between Stanford University and NASA designed to test two previously untested aspects of Albert Einstein’s general theory of relativity.

 

Looking deep into the universe, the Hubble Space Telescope catches a passing glimpse of the numerous arm-like structures that sweep around this barred spiral galaxy, known as NGC 2608. Appearing as a slightly stretched, smaller version of our Milky Way, the peppered blue and red spiral arms are anchored together by the prominent horizontal

 

This illustration imagines the view from NASA's Cassini spacecraft during one of its final dives between Saturn and its innermost rings.

 

Like a wisp of green smoke, the aurora australis seemingly intersects with the Earth's airglow as the International Space Station orbited above the Indian Ocean halfway between Australia and Antarctica.

Like a wisp of green smoke, the aurora australis seemingly intersects with the Earth's airglow as the International Space Station orbited above the Indian Ocean halfway between Australia and Antarctica.

 

Japan's resupply ship, the H-II Transfer Vehicle-9 (HTV-9), is pictured attached to the International Space Station's Harmony module.

 

Exquisite layering is revealed emerging from the sand in southern Holden Crater. Sequences like these offer a window into Mars' complicated geologic history.

 

The stars of the globular cluster NGC 6441 sparkle peacefully in the night sky, about 13,000 light-years from the Milky Way’s galactic center.

 

Lightning flashes from a storm cloud to strike the ground. Such bolts represent only a small part of the overall phenomenon of lightning.

 

The samples Apollo 11 brought back to Earth from the Moon were humanity's first from another celestial body. The upcoming Perseverance rover mission will collect the first samples from another planet.

 

A small glacier in the Arctic region of Norwegian archipelago Svalbard, as photographed by NASA's Airborne Tropical Tropopause Experiment (ATTREX).

 

On Saturday, May 30, 2020, a SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft is launched on NASA’s SpaceX Demo-2 mission to the International Space Station.

 

A SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft is launched from Launch Complex 39A on NASA’s SpaceX Demo-2 mission to the International Space Station.

 

SpaceX Falcon 9 rocket lifted off carrying the company's Crew Dragon spacecraft on NASA’s SpaceX Demo-2 mission with NASA astronauts Robert Behnken and Douglas Hurley onboard, Saturday, May 30, 2020.

 

A SpaceX Falcon 9 rocket with the company's Crew Dragon spacecraft onboard is seen illuminated on the launch pad at Launch Complex 39A as preparations continue for NASA’s SpaceX Demo-2 mission, Saturday, May 30, 2020.

 

The brilliant tapestry of young stars flaring to life resembles a glittering fireworks display in this Hubble Space Telescope image.

 

This artist's concept shows exoplanet Kepler-1649c orbiting around its host red dwarf star.

 

A SpaceX Falcon 9 rocket with the company's Crew Dragon spacecraft onboard is seen on the launch pad at Launch Complex 39A at sunrise as preparations continue for the Demo-2 mission, Wednesday, May 27, 2020.

 

In this iconic image, Staion Commander Leroy Chiao of NASA watches a water bubble float between him and the camera.

 

A SpaceX Falcon 9 rocket with the company's Crew Dragon spacecraft onboard is seen as it is rolled out of the horizontal integration facility at Launch Complex 39A as preparations continue for the Demo-2 mission.

 

NASA astronauts Robert Behnken, left, and Douglas Hurley listen as NASA Administrator Jim Bridenstine gives remarks after the crew arrived at the Launch and Landing Facility at Kennedy Space Center.

 

Annie and John Glenn arrive at the Mission Control Center for the Gemini IV launch on June 4, 1965. John Glenn was the first American to orbit the Earth.

 

Chemist Audrey Miyamoto preparing an Apollo lunar sample to analyze for amino acids at NASA’s Ames Research Center.

 

The crew of the International Space Station snapped this image of this typhoon in the South Pacific Ocean on May 13, 2020.

 

Nancy Grace Roman (1925-2018), NASA's first chief astronomer, is known as the 'Mother of Hubble.'

 

NASA's Juno mission captured this look at Jupiter's tumultuous northern regions during the spacecraft's close approach to the planet on Feb. 17, 2020.

 

Northrup Grumman's Cygnus resupply ship is pictured in the grips of the Canadarm2 robotic arm moments before its release ending its 83-day stay at the International Space Station on May 11, 2020.

 

Iowa native astronaut Raja Chari was selected by NASA to join the 2017 Astronaut Candidate Class.