Tina Buechner da Costa (left) hopes to become Germany's female astronaut. Claudia Kessler (right), CEO of HE Space, is organizing a campaign to send the first German woman into space. Soraya Sarhaddi Nelson/NPR hide caption

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Wanted: Female German Astronauts
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With this shot of Mount Fuji, astronaut Scott Kelly tweeted, "your majesty casts a wide shadow!" Scott Kelly/NASA hide caption

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Astronaut's Photos From Space Change How We See Earth
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A still image shows the Earth, as seen by Japanese geostationary satellites, during a total solar eclipse. University of Wisconsin-Madison / CIMSS and Japan Meteorological Agency and NOAA hide caption

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Expedition 43 NASA astronaut Scott Kelly (left) and his identical twin, Mark Kelly, pose for a photograph in 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Bill Ingalls/NASA/Getty Images hide caption

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'Everybody Stretches' Without Gravity: Mark Kelly Talks About NASA's Twins Study
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CSIRO's Australia Telescope Compact Array at the Paul Wild Observatory. Alex Cherney hide caption

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In A Far-Off Galaxy, A Clue To What's Causing Strange Bursts Of Radio Waves
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Albert Einstein once wrote that he was indebted to a favorite uncle for giving him a toy steam engine when he was a boy, launching a lifelong interest in science. AP hide caption

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Einstein Saw Space Move, Long Before We Could Hear It
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The Smithsonian is sharing images of astronaut graffiti aboard the Apollo 11 command module, including this tribute to the spacecraft. Smithsonian Air and Space Museum hide caption

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A simulation shows gravitational waves coming from two black holes as they spiral in together. S. Ossokine , A. Buonanno (MPI for Gravitational Physics)/W. Benger (Airborne Hydro Mapping GmbH) hide caption

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In Milestone, Scientists Detect Gravitational Waves As Black Holes Collide
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Luxembourg City, the capital of Luxembourg — shown here in 2012 — mixes the medieval and the modern. The tiny European nation is making a serious bid for the futuristic, too. Loop Images/UIG via Getty Images hide caption

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A NASA team has attached nearly all of the hexagonal segments that will together make the primary mirror for the James Webb Space Telescope (pictured are practice segments). Chris Gunn/NASA hide caption

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Massive Space Telescope Is Finally Coming Together
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This platinum-engraved sapphire disk, part of a set illustrating Earth's biodiversity, will be housed in the Earth Chamber of the MoonArk. It's designed by Mark Baskinger with Matt Zywica, Maggie Banks, Christie Chong, Bettina Chou, Adella Guo, Natalie Harmon, Deborah Lee, Deniz Sokullu and Carolyn Zhou. Courtesy of The Moon Arts Project hide caption

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An Artistic Time Capsule Prepares To Hitch A Ride To The Moon
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The Mars rover InSight will not launch as scheduled in March. A seismometer it was supposed to carry has experienced a series of vacuum leaks and cannot be repaired in time. Yang Lei/Xinhua/Landov hide caption

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The new object is one of many dwarf planets orbiting at the edge of the solar system. This artist's conception shows the previous record-holder for distance, a dwarf planet called Eris. ESO/L. Calçada hide caption

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Astronomers Spot Most Distant Object So Far In The Solar System
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The grooves on Mars' moon Phobos could be produced by tidal forces – the mutual gravitational pull of the planet and the moon, says NASA. The theory is the latest explanation for grooves that were once thought to result from the massive impact that caused the Stickney crater (lower right). NASA/JPL-Caltech/University of Arizona hide caption

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