Zoom Astronomy Glossary: M.
Galactic Center. Spiral Arms of the Milky Way. The Milky Way. The Milky Way virtual tour is a installation free program that will make you feel as if you are there.
Just drag the mouse to the direction you want to look. Use the scroll wheel to zoom at the details. Press F9 to get a list of the 3D sites you downloaded (residing in the same directory). The Milky Way Project. Milky Way. Stars and gases at a wide range of distances from the Galactic center orbit at approximately 220 kilometers per second.
The constant rotation speed contradicts the laws of Keplerian dynamics and suggests that much of the mass of the Milky Way does not emit or absorb electromagnetic radiation. This mass has been given the name “dark matter”.[22] The rotational period is about 240 million years at the position of the Sun.[9] The Galaxy as a whole is moving at a velocity of approximately 600 km per second with respect to extragalactic frames of reference. The oldest known star in the Galaxy is at least 13.6 billion years old and thus must have formed shortly after the Big Bang.[6] Surrounded by several smaller satellite galaxies, the Milky Way is part of the Local Group of galaxies, which forms a subcomponent of the Virgo Supercluster.
Messier Objects in the Milky Way Galaxy.