Recently I was looking at the APOD titled "A Dark River to Antares". The dust in the picture makes the river look somewhat murky because it is obscuring the star light in the background. The star Antares creates a yellow reflection nebula even though it is actually a red super giant star. Above Antares is the star cluster M4 which is a actually located about 7,000 light years away. The entire dark river is actually areound 500 light years long.
WOW 500 light years is really long
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