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Image 1 - Astronomers Size-Up Dwarf Planet Eris
2011-10-27 06:46:19

[ Watch the Video ] The European Southern Observatory (ESO) announced on Wednesday that astronomers have accurately measured the diameter of the dwarf planet Eris for the first time. The astronomers believe that the dwarf planet is an almost perfect twin of Pluto in terms of size.  The planet, according to ESO, appears to have a reflective surface, which suggests it is uniformly covered in a thin layer of ice. Astronomers made observations as Eris passed in front of a faint...

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2007-06-14 13:00:00

NASA's Hubble Space Telescope has teamed up with the W.M. Keck Observatory to precisely measure the mass of Eris, the largest member of a new class of dwarf planets in our solar system. Eris is 1.27 times the mass of Pluto, formerly the largest member of the Kuiper Belt of icy objects beyond Neptune. Hubble observations in 2006 showed that Eris is slightly physically larger than Pluto. But the mass could only be calculated by observing the orbital motion of the moon Dysnomia around Eris....

2005-10-02 11:51:59

By Deborah Zabarenko WASHINGTON (Reuters) - Xena, the possible 10th planet in our solar system, has its own moon, a dim little satellite called Gabrielle, its discoverers reported. Astronomers who reported Xena's discovery in July said they detected Xena's sidekick on September 10 using the Keck Observatory on Mauna Kea in Hawaii. Their findings will be submitted to the Astrophysical Journal Letters on Monday. "Since the day we discovered Xena, the big question has been whether or...

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2005-10-02 00:55:00

LOS ANGELES -- The astronomers who claim to have discovered the 10th planet in the solar system have another intriguing announcement: It has a moon. While observing the new, so-called planet from Hawaii last month, a team of astronomers led by Michael Brown of the California Institute of Technology spotted a faint object trailing next to it. Because it was moving, astronomers ruled it was a moon and not a background star, which is stationary. The moon discovery is important because it can...


Word of the Day
endocarp
  • The hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed.
This word comes from the Greek 'endon,' in, within, plus the Greek 'kardia,' heart.
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