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Hypervelocity stars are stars that escape from the Milky Way due to gravitational encounters with the supermassive black hole at the Galactic Center. Stellar kinematics is the observational study of the motions of stars and galaxies, and can identify these exotic phenomena.
Astrometry is the branch of astronomy that measures the positions and motions of stars and other celestial bodies. Learn about the history of astrometry from ancient times to modern satellites, the methods of measuring angles and parallaxes, and the applications of astrometry for timekeeping, cosmology and extrasolar planets.
The Milky Way is the galaxy that includes the Solar System, with a hazy band of light seen in the night sky. It is a barred spiral galaxy with a supermassive black hole at its center, and contains 100–400 billion stars and planets.
The motion of nearly 1.3 billion stars has been recorded as well as the location and brightness of 1.7 billion. ... visualizations of what the Milky Way looks like. The image you see above ( full ...
The European Space Agency launched the Gaia satellite and its one-billion-pixel camera to space back in 2013. Gaia has been mapping the Milky Way ever since, and now the ESA has released a 3D map ...
Learn how astronomers measure distances to celestial objects using various methods and techniques. The cosmic distance ladder is a succession of steps based on different correlations and assumptions, from direct measurements to standard candles and geometric methods.
In astronomy, the local standard of rest or LSR is a reference frame which follows the mean motion of material in the Milky Way in the neighborhood of the Sun (stars in radius 100 pc from the Sun), [1] on average sharing the same velocity around the Milky Way as the Sun. [2] The path of this material is not precisely circular. [3]
A cosmic calendar is a method to visualize the chronology of the universe, scaling its age to a single year. It shows the events of cosmology, evolution, human history and more from the Big Bang to the present day.