1. Notes: 35 / 3 months ago  from unknownskywalker
    unknownskywalker: Not-So-Bright Bulbs This artist’s concept shows the dimmest star-like bodies currently known — twin brown dwarfs referred to as 2M 0939. The twins, which are about the same size, are drawn as if viewed from one side. Brown dwarfs are neither planets nor stars. They form like stars out of collapsing clouds of gas and dust, but they don’t have enough mass to ignite nuclear burning in their cores and become full-blown stars. They are similar to Jupiter in that they are cool balls of gas, but they are warmer and heavier. The universe is littered with these cosmic misfits, but because they are so dim, they are hard to find. Spitzer Space Telescope’s infrared eyes can detect the minute glow of these cool objects. Both of the brown dwarfs making up 2M 0939 are the dimmest known, and their atmospheres are also among the coolest known for any brown dwarf (565-635 Kelvin or 560-680 °F). The term “brown dwarf” comes from the fact that these objects change color over time, and therefore do not have a definitive color. The 2M 0939 brown dwarfs, if we could see them directly with out eyes, would glow a very dark magenta color, due to their cool temperatures and the presence of water, methane and ammonia gases in their atmospheres.

    unknownskywalker:

    Not-So-Bright Bulbs

    This artist’s concept shows the dimmest star-like bodies currently known — twin brown dwarfs referred to as 2M 0939. The twins, which are about the same size, are drawn as if viewed from one side.

    Brown dwarfs are neither planets nor stars. They form like stars out of collapsing clouds of gas and dust, but they don’t have enough mass to ignite nuclear burning in their cores and become full-blown stars. They are similar to Jupiter in that they are cool balls of gas, but they are warmer and heavier.

    The universe is littered with these cosmic misfits, but because they are so dim, they are hard to find. Spitzer Space Telescope’s infrared eyes can detect the minute glow of these cool objects. Both of the brown dwarfs making up 2M 0939 are the dimmest known, and their atmospheres are also among the coolest known for any brown dwarf (565-635 Kelvin or 560-680 °F).

    The term “brown dwarf” comes from the fact that these objects change color over time, and therefore do not have a definitive color. The 2M 0939 brown dwarfs, if we could see them directly with out eyes, would glow a very dark magenta color, due to their cool temperatures and the presence of water, methane and ammonia gases in their atmospheres.

     

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