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Two comets that will safely fly past Earth later this month may have more in common than their intriguingly similar orbits. They may be twins of a sort.

Two comets that will safely fly past Earth later this month may have more in common than their intriguingly similar orbits. They may be twins of a sort.

Supermassive black holes in the universe are like a raucous choir singing in the language of X-rays.

Supermassive black holes in the universe are like a raucous choir singing in the language of X-rays.

Data from NASA's NEOWISE mission are giving new insights into comet dust, nucleus sizes, and production rates for difficult-to-observe gases like carbon dioxide and carbon monoxide.

Data from NASA's NEOWISE mission are giving new insights into comet dust, nucleus sizes, and production rates for difficult-to-observe gases like carbon dioxide and carbon monoxide.

NASA scientists are tracking the upcoming Halloween flyby of an asteroid with optical observatories and radar capabilities of the Deep Space Network at Goldstone, California.

NASA scientists are tracking the upcoming Halloween flyby of an asteroid with optical observatories and radar capabilities of the Deep Space Network at Goldstone, California.

NASA Discovers Coldest Brown Dwarf Neighbor of the Sun | Space.com  Brown dwarfs are not quite massive enough to ignite nuclear fusion, yet larger than known planets. See how brown dwarfs work in this SPACE.com infographic. Credit: by Karl Tate, Infographics Artist

NASA Discovers Coldest Brown Dwarf Neighbor of the Sun | Space.com Brown dwarfs are not quite massive enough to ignite nuclear fusion, yet larger than known planets. See how brown dwarfs work in this SPACE.com infographic. Credit: by Karl Tate, Infographics Artist

Heartbeat stars got their name because if you were to map out their brightness over time, the result looks like an electrocardiogram, a graph of the electrical activity of the heart.

Heartbeat stars got their name because if you were to map out their brightness over time, the result looks like an electrocardiogram, a graph of the electrical activity of the heart.

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