Artistic renditions of a future Mars settlement often feature structures above ground, as seen above. But after extensive research, authors Kelly and Zach Weinersmith found that any potential settlement would have to be below ground. janiecbros/Getty Images hide caption
Astronomy professors across the country are integrating climate change lessons into one of their most wide-reaching and popular courses: Introduction to Astronomy. Mark Garlick/Science Photo Library/Getty Images hide caption
Selkirkia tsering fossil found in a collection from the Fezouata Formation in Morocco. Javier Ortega Hernández/Harvard Museum of Comparative Zoology hide caption
This image provided by the Japan Aerospace Exploration Agency/Takara Tomy/Sony Group Corporation/Doshisha University shows an image taken by a Lunar Excursion Vehicle 2 (LEV-2) of a robotic moon rover called Smart Lander for Investigating Moon, or SLIM, on the moon. AP hide caption
Some of the constellations that are visible from the Northern Hemisphere at different times of the year. NASA/JPL-Caltech hide caption
The Core released to audiences 20 years ago. Ever since, audiences have bemoaned, laughed at and loved the loose use of geological science in the film. PictureLux/The Hollywood Archive/Alamy hide caption
Some of the constellations that are visible from the Northern Hemisphere at different times of the year. NASA/JPL-Caltech hide caption
NASA Small-Body Database shows the orbits of the Earth, moon and asteroid 2023 DZ2. NASA/Screenshot by NPR hide caption
This computer-generated 3D model of Venus' surface shows the summit of Maat Mons, the volcano that is exhibiting signs of activity. A new study found one of Maat Mons' vents became enlarged and changed shape over an eight-month period in 1991, indicating an eruptive event occurred. NASA/JPL-Caltech hide caption
As more robots and people travel to the moon in coming years, some researchers believe it's time to set a lunar time standard. NASA Johnson hide caption
Surfers at Sydney's Manly Beach ahead of the total lunar eclipse in Australia. Brook Mitchell/Getty Images hide caption
A supermoon is pictured near the Yellow Crane Tower in Wuhan, central China's Hubei Province, July 13, 2022. Xinhua News Agency/Xinhua News Agency via Getty Ima hide caption
In this composite image provided by NASA, the SDO satellite captures the path sequence of the transit of Venus across the face of the sun on June 5-6, 2012 as seen from space. The next pair of events will not happen again until the year 2117 and 2125. NASA/Getty Images hide caption
A man and a boy walk across the almost dried up bed of river Yamuna following hot weather in New Delhi, India, May 2, 2022. Manish Swarup/AP hide caption
NASA's Perseverance rover took this "selfie" next to a rock where it drilled for samples. NASA wants to bring samples collected by this rover back to Earth. NASA/JPL-Caltech/MSSS hide caption
In 2021, a partial solar eclipse is visible in Lewes, Del. This Saturday, people in the Southern Hemisphere will get a chance to glimpse the phenomenon. Aubrey Gemignani/NASA via Getty Images hide caption
This illustration shows NASA's DART spacecraft and the Italian Space Agency's (ASI) LICIACube prior to impact at the Didymos binary system. NASA/Johns Hopkins, APL/Steve Gribben hide caption
This image of Bennu, taken from a range of 15 miles, shows its unexpectedly rough and rocky surface. NASA/Goddard/University of Arizona hide caption
The Pacific Ocean from space. In both liquid and frozen form, water covers most of the Earth's surface, and there's been a debate among scientists about where all the water originated. Stocktrek Images/Getty Images hide caption
The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, shown in an artist's rendering, will measure tiny fluctuations in Earth's gravitational field to show how water moves around the planet. NASA/JPL hide caption