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The Sagittarius Stream is a stream of stars in polar orbit around the Milky Way leeched from the Sagittarius Dwarf. The Virgo Stellar Stream is a stream of stars that is believed to have once been an orbiting dwarf galaxy that has been completely distended by the Milky Way's gravity.
Traditionally these dwarf galaxies have been thought of as satellites in orbit around the Milky Way for many billions of years. Now, however, new data from ESA’s Gaia spacecraft have shown that the majority of the dwarf galaxies are passing the Milky Way for the first time.
The dozen or so dwarf galaxies of the Milky Way appear to contain even greater abundances of dark matter. Dark matter's pervasiveness has solidified belief in its existence.
A 3D view of the orbits of four globular clusters (blue) and three dwarf galaxies (red) in motion around our Milky Way Galaxy, based on data from the second release of ESA's Gaia...
Astronomers have discovered a previously unknown pair of potential satellite galaxies orbiting the Milky Way. The location of these dwarf galaxies suggests that hundreds of other...
A team of astronomers from the University of Cambridge has identified nine new dwarf satellite candidates orbiting the Milky Way, the largest number ever discovered at once.
The new Gaia finding reveals that the wrinkles we see in the Milky Way were likely caused by a dwarf galaxy colliding with the Milky Way around 2.7 billion years ago – in other words, a large portion of the Milky Way only joined us within the last few billion years.
Astronomers have discovered a ‘treasure trove’ of rare dwarf satellite galaxies orbiting our own Milky Way. The discoveries could hold the key to understanding dark matter, the mysterious substance which holds our galaxy together.
Physics indicates that the dwarf galaxies orbiting the Milky Way should be rich in dark matter. But if there was as much dark matter in these galaxies as predicted by classical physics, it...
A story of survival is unfolding at the outer reaches of our galaxy, and NASA’s Hubble Space Telescope is witnessing the saga. The Large Magellanic Cloud, also called the LMC, is one of the Milky Way galaxy’s nearest neighbors. This dwarf galaxy looms large on the southern nighttime sky at 20 times the apparent diameter […]