Milky Way Galaxy (sometimes simply called the Galaxy), large spiral system of about several hundred billion stars, one of which is the Sun. It takes its name from the Milky Way, the irregular luminous band of stars and gas clouds that stretches across th
The radius measurement is highly uncertain, as some of the material surrounding the planet may be masquerading as being part of the planet itself. The largest planets whose sizes are known for certain are HAT-P-67 b and XO-6b, both with diameters around 2.1 times that of Jupiter. Both of...
The disk of stars in the Milky Way does not have a sharp edge beyond which there are no stars. Rather, the concentration of stars drops smoothly with distance from the center of the Galaxy. Beyond a radius of roughly 69, the number of stars per cubic parsec drops much faster with radius...
The Earth is orbiting around the Sun, which itself is orbiting around the center of the Milky Way. Our Milky Way, the Galaxy, is the only galaxy in which we are able to study astrophysical processes in detail. Therefore, our journey through extragalactic astronomy will begin in our home Gal...
Observed Cepheid γ velocities appear on average to be 3±1 km smore negative than the true corresponding center-of-mass velocities. The trend of increasing blueness toward larger Galactocentric radius confirms the radial metallicity gradient found spectroscopically....
0.4 up to a radius ofr ≈ 0.45 arcsec. It is worth noting that the analysis of individual bands is complicated by the presence of spiral arms, which could drive the mild change in position angle (and slightly affect the ellipticity) in the outskirts of the galaxy. As a caveat,...
BEIJING, April 9 (Xinhua) -- A Chinese astronomer has discovered the fastest rotating star in the Milky Way galaxy based on data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) located in Xinglong, in northern China's Hebei Province. ...
Assume that all of the mass is spread uniformly throughout a sphere with a radius of 20 light-hours. What is the density in kg/km3? (Remember that the volume of a sphere is given by V=\frac{4}{3}{\pi} }{R}^{3}V=\frac{4}{3}{\pi} }{R}^{3} .) Explain why the ...
The Milky Way’s ‘plane of satellites’ canonically consists of the 11 ‘classical’ satellites, the brightest within a radius ofr = 300 kpc of the Galactic Centre, believed to constitute a complete sample. To characterize the spatial anisotropy of a system ofNsatellites, it is customary...
On the other hand, Schwarzschild radius is larger than tidal disruption radius for white dwarfs with [Math Processing Error], neutron stars with [Math Processing Error], and stellar black holes, so these are not subject to tidal disruption. A circularized orbit of a compact star with the semi...