Astronomers Measure Mass of Largest Dwarf Planet
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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.
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A tiny telescope has spotted a giant planet circling a faraway star, using a technique that could open a new phase of planetary discovery, scientists say.
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WASHINGTON - The largest planet ever found orbiting another star is so puffy it would float on water, astronomers said Thursday.  The newly discovered planet, dubbed HAT-P-1, is both the largest and least dense of the nearly 200 worlds astronomers have found outside our own solar system.
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or about the size of the planet Neptune, say astronomers from the University of Texas and two other institutions.
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Astronomers using telescopes not much larger than the spyglass Galileo wielded 400 years ago have discovered a new Jupiter-sized planet orbiting a bright, distant star.
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An optical illusion has caused astronomers to overestimate the size of a class of giant stars by a factor of two, according to new observations.
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An object smaller than Pluto has been discovered orbiting a dying star in what astronomers said Monday resembles a pint-sized version of our solar system.
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The surface of one of the brightest stars in the night sky is imaged by scientists.
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This discovery was made possible by the unprecedented accuracy of the HARPS spectrograph on ESO&#39;s 3.6-m telescope at La Silla, which allows radial velocities to be measured with a precision better than 1 m/s.
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1m star clusters form consternation in night sky A group of scientists are looking for internet volunteers to take part in what they claim will be the largest galactic census ever compiled.â¦
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The largest asteroid ever known to pass near Earth is making a close celestial brush with the planet this week in an event that professional and backyard astronomers are watching closely.
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Astronomers write a new definition that officially makes Pluto a planet. But that means 2003 UB313 is one too
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With the help of a modified backyard telescope, astronomers have discovered a giant planet orbiting another star. It is the first extrasolar world found with such modest equipment.
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A new extra-solar planet has been identified orbiting a star 500 light years from our solar system. The discovery was made by a team using a four-inch diameter telescope to make their observations - a size
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Astronomers using NASA's Hubble Space Telescope have photographed one of the smallest objects ever seen around a normal star beyond our Sun. Weighing in at 12 times the mass of Jupiter, the object is small enough to be a planet.
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SAN DIEGO&nbsp;-- Astronomers are highly confident that they've taken the first photograph of a planet outside our solar system.
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Astronomers have discovered the three lightest planets known outside the solar system, moving researchers closer to the goal of finding extrasolar planets that resemble Earth.