mboost-dp1
NASA
#5
Så de kan blive halvstore :)
And once again, how large can they get? Again, here’s Dr. Raymond:
“In terms of gaseous planets, once they reach 15 Jupiter masses or so there is enough pressure in the core to ignite deuterium fusion, so those are considered “brown dwarfs” rather than planets.”
Så de kan blive halvstore :)
#6
Wikipedia mener noget andet:
Wikipedia mener noget andet:
With a mass only 93 times that of Jupiter, AB Doradus C, a companion to AB Doradus A, is the smallest known star undergoing nuclear fusion in its core.[107] For stars with similar metallicity to the Sun, the theoretical minimum mass the star can have, and still undergo fusion at the core, is estimated to be about 75 times the mass of Jupiter.[108][109] When the metallicity is very low, however, a recent study of the faintest stars found that the minimum star size seems to be about 8.3% of the solar mass, or about 87 times the mass of Jupiter.[109][110] Smaller bodies are called brown dwarfs, which occupy a poorly defined grey area between stars and gas giants.
Nyhed(0) skrev:
It’s amazingly compact, it’s amazingly flat, there’s an amazingly large number of big planets orbiting close to their star - we didn’t know such systems could even exist
....It's pretty amazing and I'm amazed of these amazing discoveries... ;-)
Men ellers ER det da en spændende astronomisk nyhed. Bare ærgeligt at vi ikka kan finde ud af at rejse med en fornuftig hastighed. Fantastisk hvis vi kunne kolonisere nye solsystemer...
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