Planet Fitness is offering high school students a free opportunity to stay active this summer. High school students ages ...

The TNO, which are described as minor planets that orbit the sun at a greater distance than Neptune, were found on the edge ...

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Less than 1% of this dwarf planet candidate's orbit is close enough to detect, which means astronomers are lucky to have ...

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

The Red Planet and Earth align properly for interplanetary missions just once every 26 months. The next such opportunity ...

Scientists hunting for Planet Nine, an elusive planetary body that could change our understanding of the solar system, have ...

A newly identified dwarf planet, named 2017 OF201, has been discovered in the distant outer reaches of the solar system.

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The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.