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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.
Learn about different coordinate systems used in astronomy to specify positions of celestial objects relative to various reference frames. The equatorial system is based on Earth's equator and the celestial poles, and is the normal coordinate system for most star maps.
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 galaxy rotation curve is a plot of the orbital speeds of stars or gas in a galaxy versus their radial distance from the center. The curve shows a discrepancy between the observed and theoretical velocities, which is explained by the existence of dark matter.
Learn about the position and size of Earth in the Solar System and the Universe, based on telescopic observations and scientific measurements. Compare Earth with other celestial bodies and structures, such as the Sun, the Moon, the Kuiper belt, and the Oort cloud.
Figure 1: Geometry of the Oort constants derivation, with a field star close to the Sun in the midplane of the Galaxy. Consider a star in the midplane of the Galactic disk with Galactic longitude at a distance from the Sun. Assume that both the star and the Sun have circular orbits around the center of the Galaxy at radii of and from the Galactic Center and rotational velocities of and ...
English: Sun's Path Around the Milky Way. An illustration showing the path of the Sun, Earth and Moon around the Milky Way. The inclinations of the Ecliptic Plane and Celestial Equator are shown with respect to the Galactic North Pole and Galactic Plane. The inclination of the moon's orbit is shown relative to the Ecliptic Plane.