This computer-generated 3D model of Venus' surface shows the summit of Maat Mons. A new study found one of the volcano's vents became bigger and changed during 1991. NASA/JPL-Caltech hide caption
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Mars rover
Perseverance takes a selfie with its helicopter companion Ingenuity in the background. NASA/JPL-Caltech/MSSS hide caption
NASA's Perseverance rover marks its first year hunting for past life on Mars
Canyon de Chelly National Monument ("Tséyi'" in Navajo) in Arizona is located on Navajo Nation land. NASA/JPL-Caltech hide caption
An image captured by the navigation cameras of NASA's Perseverance rover shows tracks on the surface of Mars during the rover's first test drive on March 4. NASA/JPL-Caltech hide caption
The first high-resolution full-color image of the Martian surface by Perseverance, taken by the Hazard Cameras on the underside of the rover. NASA hide caption
NASA's Perseverance rover and its experimental aerial drone, the Ingenuity Mars Helicopter, are shown in an artist's rendering. NASA/JPL-Caltech hide caption
An selfie taken by China's Tianwen-1, made available by the China National Space Administration, in December. China announced Wednesday that the probe had entered orbit around Mars. China National Space Administration/AP hide caption
The United Arab Emirates' Hope probe will launch from Tanegashima Space Center in Japan and will reach Mars in February 2021. Mohammed Bin Rashid Space Centre hide caption
An artist's concept shows a NASA Mars exploration rover on the surface of Mars. The twin rovers Spirit and Opportunity were launched in 2003 and arrived at sites on Mars in January 2004. NASA/JPL-Caltech hide caption
NASA's rover Curiosity crawls up the side of Vera Rubin Ridge on Mars' surface in January 2018. Mount Sharp — a 3-mile-high mountain — can be seen in the distance. MSSS/ NASA/JPL-Caltech hide caption
NASA engineers on the flight team celebrate the InSight spacecraft's successful landing on Mars at the NASA Jet Propulsion Laboratory in Pasadena, Calif., on Monday. Al Seib/AFP/Getty Images hide caption
A dust storm has reduced sunlight and visibility on Mars. But NASA's Curiosity rover, seen in a self-portrait taken last week in the Gale Crater, runs on nuclear energy and is powering through. NASA/JPL-Caltech via AP hide caption
This simulated 3-D perspective view of Chasma Boreale, a canyon that reaches 570 kilometers (350 miles) into the north polar cap on Mars, was created from image data taken by NASA's Mars Odyssey spacecraft. NASA/JPL/Arizona State University, R. Luk hide caption
Alex Longo makes a pitch at the Lunar and Planetary Institute in Houston, Texas, in October 2015. The Institute sponsored the conference to pick a landing site for the first human landing on Mars. Long has proposed a site for a different mission — a rover landing. Bill Ingalls/NASA hide caption
Big science in orbit: the Hubble Space Telescope NASA hide caption