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The Milky Way is the galaxy that includes the Solar System, with a diameter of 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years ). It is a barred spiral galaxy with a supermassive black hole at its center and many satellite galaxies.
Gaia Sausage or Gaia Enceladus is the name given to the remains of a dwarf galaxy that merged with the Milky Way about 8–11 billion years ago. It contributed eight globular clusters and 50 billion solar masses of stars, gas and dark matter to the Milky Way, and caused the formation of the thick disk and the metal-rich halo.
Sagittarius A* is the central supermassive black hole of the Milky Way galaxy, with a mass of 4.297 million solar masses. It was imaged by the Event Horizon Telescope in 2022, confirming its status as a black hole and testing Einstein's theory of relativity.
The stars in our galaxy’s heart are metal-poor, so we dubbed this region the Milky Way’s ‘poor old heart,’” said Rix, director of the Max Planck Institute for Astronomy’s department of ...
A comprehensive list of stars with approved or traditional names, as well as their constellations, designations, and pronunciations. The list is updated regularly by the International Astronomical Union and includes stars from the sky and exoplanets.
The Milky Way. Population II stars are in the galactic bulge and globular clusters. Artist’s impression of a field of population III stars 100 million years after the Big Bang. Population II, or metal-poor, stars are those with relatively little of the elements heavier than helium. These objects were formed during an earlier time of the universe.
Find out which stars are the largest in the Milky Way and beyond, based on their radius and luminosity. Compare different methods and sources of measuring stellar sizes, and learn about the challenges and caveats of determining accurate values.
Find out the names, distances, and properties of the 131 stars and dwarfs within 20 light-years of the Sun. See an animated 3D map, a radar map, and a table of data with spectral types, magnitudes, and parallaxes.