25 Nov '11, 11pm

Hovering on the Horizon: The limb of the Earth is a work of awesome beauty and a gift to science.

The limb of the Earth is a work of awesome beauty and a gift to science. When observed from space, the palette of gaseous layers of atmosphere reminds us of the fragility and tenuousness of the cocoon that shelters life from cold, harsh space. That same view also allows scientists to detect the gases and particles that make up our the different layers of our atmosphere. Astronauts aboard the International Space Station captured a bit of both in this digital photograph from July 31, 2011. They threw in the Moon as an extra gift. Closest to Earth's surface, the orange-red glow reveals Earth's troposphere—the lowest, densest layer of the atmosphere, and the one we live within. A brown transitional layer is the upper edge of the troposphere, known as the tropopause. A milky white and gray layer sits above that, likely a slice of the stratosphere with perhaps some noctilucent c...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=76534&s...

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Hovering on the Horizon: The limb of the Earth ...

earthobservatory.nasa.gov 25 Nov '11, 11pm

The limb of the Earth is a work of awesome beauty and a gift to science. When observed from space, the palette of gaseous ...

Oulu, Finland [image] #NASA

earthobservatory.nasa.gov 26 Nov '11, 11pm

The city of Oulu, Finland, lies at the mouth of the Oulujoki River along the Gulf of Bothnia. The northerly location makes...