Search results
Results from the WOW.Com Content Network
Physics Galaxy was founded as an online learning portal by Ashish Arora. [2] It was founded as an initiative to coach students for free especially for those in rural areas, who cannot afford expensive coaching facilities. Later in 2011, a YouTube channel of the same name was founded. [3] [4]
This is a list astronomy websites. Some of them are CalSky, Exoplanet Archive, Exoplanet Data Explorer, Extrasolar Planets Encyclopaedia, Universe Today, Space.com and Galaxy Zoo. Out of all these Exoplanet Archive is managed by NASA. These websites provide knowledge about exoplanets, eclipses, tides, comets, stars, galaxy and other topics ...
It was intended that the journal would fill the gap between journals in astronomy and physics, providing a venue for publication of articles on astronomical applications of the spectroscope; on laboratory research closely allied to astronomical physics, including wavelength determinations of metallic and gaseous spectra and experiments on ...
Note the boxy shape of the final galaxy, similar to the shapes of bars observed in many spiral galaxies. The firehose instability (or hose-pipe instability) is a dynamical instability of thin or elongated galaxies. The instability causes the galaxy to buckle or bend in a direction perpendicular to its long axis.
The density wave theory also explains a number of other observations that have been made about spiral galaxies. For example, "the ordering of H I clouds and dust bands on the inner edges of spiral arms, the existence of young, massive stars and H II regions throughout the arms, and an abundance of old, red stars in the remainder of the disk".
The rotation curve of a disc galaxy (also called a velocity curve) is a plot of the orbital speeds of visible stars or gas in that galaxy versus their radial distance from that galaxy's centre. It is typically rendered graphically as a plot , and the data observed from each side of a spiral galaxy are generally asymmetric, so that data from ...
Velocity dispersion (y-axis) plotted against absolute magnitude (x-axis) for a sample of elliptical galaxies, with the Faber–Jackson relation shown in blue.. The Faber–Jackson relation provided the first empirical power-law relation between the luminosity and the central stellar velocity dispersion of elliptical galaxy, and was presented by the astronomers Sandra M. Faber and Robert Earl ...
Rotation curve of a typical spiral galaxy: predicted (A) and observed (B). Can the discrepancy between the curves be attributed to dark matter? Galaxy rotation problem: Is dark matter (solely) responsible for differences in observed and theoretical speed of stars revolving around the center of galaxies?