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ScienceDaily: Space & Time News |
| Largest comet ever observed was active at near-record distance Posted: 29 Nov 2021 02:28 PM PST Astronomers show that comet Bernardinelli-Bernstein (BB), the largest comet ever discovered, was active long before previously thought, meaning the ice within it is vaporizing and forming an envelope of dust and vapor known as a coma. Only one active comet has been observed farther from the sun, and it was much smaller than comet BB. |
| Strong winds power electric fields in the upper atmosphere Posted: 29 Nov 2021 02:27 PM PST Using observations from NASA's ICON mission, scientists presented the first direct measurements of Earth's long-theorized dynamo on the edge of space: a wind-driven electrical generator that spans the globe 60-plus miles above our heads. The dynamo churns in the ionosphere, the electrically charged boundary between Earth and space. It's powered by tidal winds in the upper atmosphere that are faster than most hurricanes and rise from the lower atmosphere, creating an electrical environment that can affect satellites and technology on Earth. |
| In the quantum realm, not even time flows as you might expect Posted: 26 Nov 2021 10:08 AM PST A team of physicists has shown how quantum systems can simultaneously evolve along two opposite time arrows - both forward and backward in time. The study necessitates a rethink of how the flow of time is understood and represented in contexts where quantum laws play a crucial role. |
| Orbital harmony limits late arrival of water on TRAPPIST-1 planets Posted: 25 Nov 2021 12:48 PM PST Seven Earth-sized planets orbit the star TRAPPIST-1 in near-perfect harmony, and researchers have now used that harmony to determine how much physical abuse the planets could have withstood in their infancy. |
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