Space

Gravitational waves — ripples in the fabric of space-time — are a big deal in the world of science. Here's a video that helps explain how they work.

If you time it just right, tossing a ball in the air as an elevator starts to move, the ball seems to hang in the air for a moment, like gravity had been canceled, says astrophysicist Adam Frank.

Author Kim Stanley Robinson deserves a place as a true visionary: He has done more than just write good science-fiction — he's mapped out new territory in what it means to be human, says Adam Frank.

President Trump's pick for the next head of NASA, Rep. Jim Bridenstine, R-Okla., will have his Senate nomination hearing on Wednesday. He's been controversial because of his views on climate change.

Astronomers are eager to learn more about the visitor as it zooms through, like how far-off planets form: "You'd love to see if it looks like stuff in our solar system."

Selected by NASA in 1966, Weitz went on to fly on the first manned Skylab mission and performed vital space walks to fix the stricken station. He later commanded the maiden flight of Challenger.

By late Monday, the thesis had been viewed more than 60,000 times, a Cambridge official says. He adds, "Other popular theses might have 100 views per month."

Last year, the Orionids were hampered by a bright moon. But this year, there's barely a sliver of moon in the sky, which should allow the remnants of Halley's Comet to shine.

Astronomy is forever changed by the viewing of the collision of neutron stars; we can now watch these processes in many different ways as they run their course, says astrophysicist Marcelo Gleiser.