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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]
David Elbaz (born March 18, 1966) is a French observational astrophysicist specializing in galaxy formation and evolution.He is a Research Director at the Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA-Saclay), where he has worked as a researcher in the Astrophysics Division (AIM) since 1994.
Siegel was born to "a Jewish postal worker" [2] and grew up in the Bronx, where he attended Bronx High School of Science until 1996. Siegel graduated from Northwestern University with a B.A. degree in physics, classics and integrated science in 2000, and went on to earn his Ph.D. degree in astrophysics from the University of Florida in 2006.
And inside such a typical galaxy the dynamical friction and accretion on stellar black holes over a 10-Gyr Hubble time change the black hole's velocity and mass by only an insignificant fraction % if the black hole makes up less than 0.1% of the total galaxy mass N M ⊙ ∼ 10 6 − 11 M ⊙ {\displaystyle NM_{\odot }\sim 10^{6-11}M_{\odot }} .
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 galaxy also contains a dynamically significant magnetic field, meaning that the dynamics are governed by the equations of compressible magnetohydrodynamics. In many cases, the electrical conductivity is large enough for the ideal MHD equations to be a good approximation, but this is not true in star forming regions where the gas density is ...
Three years after the original suspect in a nearly 40-year-old double murder was exonerated based on DNA evidence and freed from prison after 20 years, a Georgia man has been arrested and charged ...
The effect of dynamical friction explains why the brightest (more massive) galaxy tends to be found near the center of a galaxy cluster. The effect of the two body collisions slows down the galaxy, and the drag effect is greater the larger the galaxy mass. When the galaxy loses kinetic energy, it moves towards the center of the cluster.