Astronomy Picture of Day: the Milky Way# Astronomy - 天文
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Counting Stars in the Infrared Sky
Explanation: The bulging center of our Milky Way Galaxy, dark cosmic clouds, the thin
galactic plane, and even nearby galaxies are easy to spot in this sky view. But each pixel in
the digital image is actually based on star counts alone -- as derived from the Two Micron
All Sky Survey (2MASS) database. In 2001, the 2MASS project completed a ground-based
survey of the entire sky and cataloged upwards of 250 million stars. Their full all-sky picture
assigns a bri
Explanation: The bulging center of our Milky Way Galaxy, dark cosmic clouds, the thin
galactic plane, and even nearby galaxies are easy to spot in this sky view. But each pixel in
the digital image is actually based on star counts alone -- as derived from the Two Micron
All Sky Survey (2MASS) database. In 2001, the 2MASS project completed a ground-based
survey of the entire sky and cataloged upwards of 250 million stars. Their full all-sky picture
assigns a bri