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ScienceDaily: Space & Time News |
| Asteroids: Researchers simulate defense of Earth Posted: 29 Jun 2022 12:03 PM PDT NASA's Double Asteroid Redirection Test (DART) mission is the world's first full-scale planetary defense test against potential asteroid impacts on Earth. Researchers now show that instead of leaving behind a relatively small crater, the impact of the DART spacecraft on its target could leave the asteroid near unrecognizable. |
| Falling stardust, wobbly jets explain blinking gamma ray bursts Posted: 29 Jun 2022 09:11 AM PDT Astrophysicists have developed the first 3D simulation of the entire evolution of a jet -- from its birth by a rotating black hole to its emission far from the collapsing star. Simulation shows that as the star collapses, its material falls on the disk that swirls around the black hole. This falling material tilts the disk, and, in turn, tilts the jet, which wobbles as it struggles to return to its original trajectory. The wobbling jet explains the longstanding mystery of why gamma ray bursts blink and shows that these bursts are even rarer than previously thought. |
| Is there a right-handed version of our left-handed universe? Posted: 28 Jun 2022 02:01 PM PDT To solve a long-standing puzzle about how long a neutron can 'live' outside an atomic nucleus, physicists entertained a wild but testable theory positing the existence of a right-handed version of our left-handed universe. They designed a mind-bending experiment to try to detect a particle that has been speculated but not spotted. If found, the theorized 'mirror neutron' -- a dark-matter twin to the neutron -- could explain a discrepancy between answers from two types of neutron lifetime experiments and provide the first observation of dark matter. |
| Long-term liquid water also on non-Earth-like planets? Posted: 27 Jun 2022 11:14 AM PDT Liquid water is an important prerequisite for life to develop on a planet. As researchers report in a new study, liquid water could also exist for billions of years on planets that are very different from Earth. This calls our currently Earth-centred idea of potentially habitable planets into question. |
| Ancient microbes may help us find extraterrestrial life forms Posted: 27 Jun 2022 07:02 AM PDT Using light-capturing proteins in living microbes, scientists helped reconstruct what life was like for some of Earth's earliest organisms. These efforts could help us one day recognize signs of life on other planets. |
| Climate damage caused by growing space tourism needs urgent mitigation Posted: 26 Jun 2022 05:02 PM PDT A formidable space tourism industry may have a greater climate effect than the aviation industry and undo repair to the protective ozone layer if left unregulated, according to a new study. |
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