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| Methane in plumes of Saturn's moon Enceladus: Possible signs of life? Posted: 06 Jul 2021 03:09 PM PDT A study concludes that known geochemical processes can't explain the levels of methane measured by the Cassini spacecraft on Saturn's icy moon. While the paper by no means suggests that life exists on Enceladus, the results would be consistent with microbial activity similar to that known to occur at hydrothermal vents in Earth's oceans. |
| Satellite galaxies can carry on forming stars when they pass close to their parent galaxies Posted: 06 Jul 2021 10:31 AM PDT Using sophisticated simulations of the whole of the Local Group of galaxies, including the Milky Way, the Andromeda galaxy and their respective satellite galaxies, researchers have shown that the satellites not only can retain their gas but can also experience many new episodes of star formation just after passing close to the pericenter of their parent galaxy. |
| Kepler telescope glimpses population of free-floating planets Posted: 06 Jul 2021 08:54 AM PDT Tantalizing evidence has been uncovered for a mysterious population of 'free-floating' planets, planets that may be alone in deep space, unbound to any host star. The results include four new discoveries that are consistent with planets of similar masses to Earth. |
| Sculpted by starlight: A meteorite witness to the solar system's birth Posted: 06 Jul 2021 08:54 AM PDT Scientists knew a burst of UV light left its mark on our solar system. Now they know the source of that light. |
| Mystery of heavy elements in galactic cosmic rays Posted: 06 Jul 2021 07:20 AM PDT Scientists have used data from the Southwest Research Institute-led Magnetospheric Multiscale (MMS) mission to explain the presence of energetic heavy elements in galactic cosmic rays (GCRs). GCRs are composed of fast-moving energetic particles, mostly hydrogen ions called protons, the lightest and most abundant elements in the universe. Scientists have long debated how trace amounts of heavy ions in GCRs are accelerated. |
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