Frontier Channel

News and commentary about the Great Frontiers

ISS007-E-10807 (21 July 2003) --- This view of Earth's horizon as the sunsets over the Pacific Ocean was taken by an Expedition 7 crewmember onboard the International Space Station (ISS). Anvil tops of thunderclouds are also visible. Credit: Earth Science and Remote Sensing Unit, NASA Johnson Space Center

Image Credit: ISS007-E-10807 (21 July 2003) – Earth Science and Remote Sensing Unit, NASA Johnson Space Center

Sedna in the Sky with Diamonds

Richard Leis

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Published.

Artist's conception of Sedna, a planet-like object so far away that the Sun appears as an extremely bright star instead of the large, warm disc observed from Earth.
Image Caption: “Artist’s conception of Sedna, a planet-like object so far away that the Sun appears as an extremely bright star instead of the large, warm disc observed from Earth.” Image Credit: NASA/JPL-Caltech/R. Hurt (SSC)

Tenth planet? Oort cloud member? Planet-like? Just call it Sedna, the newly discovered furthest object in our solar system, second only to Mars in redness and estimated to be about three-fourths the size of Pluto.

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