US EditionAstronomers discover ‘inside out’ solar system
The LHS 1903 planetary system has four planets in a rare rocky-gaseous-gaseous-rocky order, suggesting sequential inside-out formation, researchers reported in Science.
- Astronomers detected an unusual planetary system around a red dwarf star called LHS 1903, with the order of planets being rocky-gaseous-gaseous-rocky instead of the expected rocky-gaseous order.
- The lead author Thomas Wilson explained that rocky planets typically do not form so far away from their host star, suggesting this system formed in a gas-depleted environment.
- This challenges the widely accepted theory that planets form simultaneously in a protoplanetary disc, as the fourth planet in this system seems to have formed after the system ran out of gas.
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91 Articles
Astronomers puzzle over ‘inside out’ planetary system
Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that formed beyond the orbits of its gaseous neighbours, possibly after much of the planet-forming material had been used up. The system, observed using the European Space Agency’s Cheops space telescope, consists of four planets — two rocky and two gaseous — orbiting a relatively small and dim star called a red dwarf about 117 lig…
Over 100 years of light from the Earth, a planetary system is attracting astronomers and can force science to review consolidated concepts about the formation of the world. Observations made by telescopes of the Nasa and the European Space Agency (USA) revealed an unusual architecture around the star LHS 1903, a red-year, most common star type in the universe. Nasa reveals that Jupiter is smaller and more complex than it had imagined for the fir…
Science Daily
Conservative AngleRocky planet discovered in outer orbit challenges planet formation theory
Astronomers have uncovered a distant planetary system that flips a long-standing rule of planet formation on its head. Around the small red dwarf star LHS 1903, scientists expected to find rocky planets close in and gas giants farther out — the same pattern seen in our own Solar System and hundreds of others. And at first, that’s exactly what they saw. But new observations revealed a surprise: the outermost planet appears to be rocky, not gaseou…
Astronomers have discovered a star whose planets that record around them occur in an unusual order: television, gas, gas, and again, again and again. In addition, the planets appear to have not formed simultaneously, challenging such current theories, according to a study published in Science magazine.
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