A false-color image from Operational Land Imager (OLI) on the Landsat 8 satellite shows flooding along the Nueces River after a historic amount of rain from the remnants of Hurricane Willa in central Texas, Nov. 1, 2018. (Photo/Agencies)
The Betsiboka Estuary in Madagascar, draining into the sea and showing changing landscapes due to decimation of rainforests and coastal mangroves, is seen from the International Space Station, Jul. 11, 2018. (Photo/Agencies)
An orange hue envelops the Earth, known as "airglow," a phenomenon that occurs when ultraviolet radiation hits molecules in the atmosphere and creates a band of light that reaches 50 to 400 miles high, in this image taken on board the International Space Station (ISS), Oct. 7, 2018. (Photo/Agencies)
An artist's rendering of how the first stars in the universe may have looked, in this undated handout image obtained by Reuters Feb. 27, 2018. (Photo/Agencies)
Ultraviolet radiation and stellar winds from a giant star called Herschel 36 push through dust in curtain-like sheets in the Lagoon Nebula stellar nursery, located 4,000 light years away, in this Hubble Space Telescope image obtained Sept. 26, 2018. (Photo/Agencies)
The dry and dusty surface of Mars is seen after a meteoroid hit and exploded, creating an impact crater 5 meters across and triggering a one-kilometer-long slope streak, or avalanche, in this image captured by NASA's Mars Reconnaissance Orbiter and obtained Sept. 26, 2018. (Photo/Agencies)
An image captured by the Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite shows the process of cold air (seen as bright areas) sinking into valleys and turning into fog, during autumn in the Cumberland Mountains of West Virginia, Oct. 24, 2018. (Photo/Agencies)
A false-color image from Operational Land Imager (OLI) on the Landsat 8 satellite shows flooding along the Nueces River after a historic amount of rain from the remnants of Hurricane Willa in central Texas, Nov. 1, 2018. (Photo/Agencies)
A "self-portrait" of NASA's Curiosity Mars rover shows the vehicle on Vera Rubin Ridge on the planet Mars, which the rover has been investigating for the past several months, according to NASA, in this handout photo mosaic assembled from dozens of images taken Jan. 23, 2018. (Photo/Agencies)
The Soyuz MS-08 spacecraft carrying the crew of astronauts Drew Feustel and Ricky Arnold of the U.S. and crewmate Oleg Artemyev of Russia blasts off to the International Space Station (ISS) from the launchpad at the Baikonur Cosmodrome, Kazakhstan, March 21, 2018. (Photo/Agencies
A cross-section of a thick sheet of underground ice is exposed at the steep slope that appears bright blue in this enhanced-color view of Mars from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter in this image released on Jan. 11, 2018. (Photo/Agencies)
NASA's Juno spacecraft captures Jupiter's southern hemisphere, as the spacecraft performed its 13th close flyby of Jupiter on May 23, 2018. (Photo/Agencies)
