In the close Universe, the distance typically is a predictor of speed: more distant galaxies recede more rapidly. Another ...

A vast, flat sheet of dark matter may solve the long-standing mystery of why our neighboring galaxy Andromeda is speeding ...

In space, the gravitational pull of massive objects is irresistible to smaller ones. Moons are locked in orbit around planets. Planets, asteroids and comets orbit more massive stars, and stars collect ...

Astronomers have chased hypervelocity stars for more than a century. These rare objects move so fast that the Milky Way cannot keep them.

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A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...

The distance between the Milky Way and Andromeda in 50 simulations. Just slightly more than half of orbits result in a Milky Way - Andromeda collision within 10 billion years. Sharp features in ...

Our understanding of the galaxy has advanced with every leap in the number of stars. From early observations to more and more advanced space and ground-based telescopes, each milestone has revealed ...

The Milky Way is our home galaxy with a disc of stars that spans more than 100,000 light-years. While the Milky Way is generally always visible from Earth, certain times of year are better for ...