Tag Archives: Dwarf Planets

Historical study revisits debate over Pluto

Twelve years after the International Astronomical Union voted in a definition of planethood that reclassified Pluto, the debate goes on. A newly published study uses the historical record to take aim at the definition’s most controversial clause: the idea that … Continue reading

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Pluto’s champions tell the tale of an epic mission

It took nine years for NASA’s New Horizons spacecraft to get to Pluto, and laying the groundwork for that history-making space mission here on Earth took nearly twice as long. The drama and intrigue surrounding New Horizons during those decades, as chronicled … Continue reading

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Water, water everywhere on dwarf planet Ceres

Readings from instruments aboard NASA’s Dawn orbiter support the view that a treasure trove of frozen water lies just beneath the surface of the dwarf planet Ceres. Researchers reported those findings today at the American Geophysical Union’s fall meeting San Francisco, … Continue reading

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Dawn probe points to ice volcano on Ceres

Scientists say a mysterious mountain on the dwarf planet Ceres was apparently once an ice volcano, spewing salty water and mud instead of lava. They also say Ceres has patches of water ice that can be seen on or near … Continue reading

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Hunt for Planet Nine leads to mini-worlds

The hypothetical world known as Planet X or Planet Nine hasn’t yet been found, but thanks to the search, astronomers have discovered smaller worlds on the solar system’s edge. Mapping such objects could lead to the big discovery: a planet that’s thought to … Continue reading

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One year later, New Horizons revisits Pluto flyby

One year ago today, NASA’s New Horizons probe whizzed past Pluto and opened up a new frontier for planetary science – and to mark the occasion, the mission team is looking back at its greatest hits and looking ahead to a landing. … Continue reading

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Astronomers spot an icy world beyond Pluto

Astronomers have found an icy world that ranges far beyond the orbit of Neptune and may well rank as a dwarf planet alongside Pluto. The newly detected object, designated 2015 RR245, is thought to be less than a third the width … Continue reading

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