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The asteroid Ryugu is light and fluffy. Images taken by Japan’s Hayabusa2 spacecraft suggest the whole asteroid is highly porous, scientists report in Nature on March 16. “It is something like freeze-dry coffee,” says planetary scientist Tatsuaki Okada of the Japanese Aerospace Exploration Agency. If early protoplanets had similar structures, that could mean planets formed […] More
A joint European and Russian mission to Mars is being postponed from July until sometime in 2022, as the coronavirus pandemic is preventing scientists from resolving a few technical difficulties, the European Space Agency said March 12. “We cannot fly in 2020,” ESA director general Jan Wörner says. “This is a disappointment for me personally, […] More
On one distant world, “heavy metal” could be a weather forecast. Telescope observations indicate that an exoplanet nearly 400 light-years away has iron rain. The planet, dubbed WASP 76b, is an extreme kind of exoplanet known as an ultrahot gas giant (SN: 7/30/19). These worlds “are complete oddballs,” says astronomer David Ehrenreich of the University […] More
Some puzzling planets called superpuffs could be Saturns in disguise. These exoplanets appear very large given their masses, suggesting that they have densities like cotton candy. Astronomers have struggled to explain how these planets could have turned out so fluffy (SN: 11/30/15). “People had been thinking of complicated ways to explain these mysterious planets,” such […] More
Meet Perseverance, NASA’s next ambassador to the Red Planet. The Mars rover’s new name was announced March 5, after a six-month “Name the Rover” competition that drew more than 28,000 entries from students in kindergarten through high school. Students were asked to make their name suggestions in essays. The winning entry came from 7th grader […] More
Two sets of cosmic discoveries have garnered the 2019 Nobel Prize in physics. Half of the prize of 9 million Swedish kronor (about $900,000) goes to James Peebles of Princeton University, who discovered new theoretical tools to study the universe. His research includes studies of the cosmic microwave background, or CMB, light emitted early in […] More
The Number of the HeavensTom SiegfriedHarvard Univ., $29.95 There is no bigger question than whether the universe is all there is. Scientists are juggling several ideas for what a multiverse, if one exists, might be like. Our universe could be one bubble in a vast cosmic fizz. Or one of many 3-D domains stacked, like […] More
SANTA BARBARA, Calif. — The word “crisis” hung in the air from the very beginning of the meeting. In a room just steps from the ocean in Santa Barbara, astronomers and physicists shifted restlessly in their chairs. Sunshine and sea breezes beckoned, but the scientists had cloistered themselves to debate one of the biggest quandaries […] More
