Darth_Lukecash: [static.tumblr.com image 500x266]Probably should ask this guy about it[www.doctorwhoreviews.co.uk image 600x337]
The Bad Astronomer: This goes back to my long-standing point about Pluto and planethood status: Trying to define a term like "planet" or "star" will just get you into trouble at the borders. It's best not to define them, and instead use them as concepts, like "continents".
JoieD'Zen: Subby has staaaars in his eyes,
farkingismybusiness: [i1.ytimg.com image 480x360]Subby's head games are giving me double vision and it feels like the first time.
farkingismybusiness: Subby's head games are giving me double vision and it feels like the first time.
The Bad Astronomer: You could have a planet with, say, 5 Jupiter masses that formed by accretion in a protoplanetary disk, and a BD that formed from collapse with a mass of 5 Jupiters, and if you put them side by side they'd look just the same.
rdyb: Can anybody explain whether this means anything about the dark matter enigma? At one point I thought i had an understanding that one of the justifications for dark matter comes from some cosmological models of the origin of matter that are build on assumptions about ratio of masses of distant galaxies to the amount of light they emit. Big ol' stars just floating would seem to justify some more mass in that ratio...
dragonchild: To make a correction, the original hypothesis of dark matter wasn't to solve a cosmological problem. What they did was estimate the mass of galaxies based on the starlight, and it turns out that (looking at the Doppler shifts of the spiral arms) galaxies spin way too fast for the estimated mass to hold it together. The difference was determined to be matter that doesn't emit light, so they dubbed it. . . dark matter.
ZAZ: If MACHOs are planetary mass objects, they should end up in the same place as the stars after a high speed encounter between galaxies. Neither gravity nor impact of gas should affect their motion significantly.
stamped human bacon: This sounds like the very definition of a cosmological problem.
Xaxor: Darth_Lukecash: [static.tumblr.com image 500x266]Probably should ask this guy about it[www.doctorwhoreviews.co.uk image 600x337]Damn, faster than me.
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