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Image of the Gravitationally bound system of stars
Gravitationally bound system of stars

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias.

Science / Feb 5

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Image of the Astronaut experiences
Astronaut experiences

A panel of astronauts discuss building a community in space and using art to bring the experience of space home.

Missions / Feb 13

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km Aphelion


d Orbital period