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A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt, is helping scientists nail down their respective masses, a new study reports.

The Kuiper Belt is a region in space beyond the orbit of

Astronomers have released the clearest images yet of the infant universe — and they confirm that the leading theory of the universe’s evolution accurately describes its early stages.

The new images capture light that travelled for more than 13…

Samples drilled from deep beneath the sea have revealed just how much global sea levels changed following the last ice age.

Melting ice caps in North America, Antarctica and Europe caused sea levels to rise quickly as temperatures warmed after…

Birds are often associated with flight, but not all of them take to the skies. Around 60 species — fewer than 1% of all bird species — are flightless, including ostriches, penguins and kiwis. These birds evolved from flying ancestors but…