Milky Way GalaxySolar NeighborhoodStellar SystemsApproximationDriftKinematicsPopulationsAnalytical approximations valid for a cold and vertically self-gravitating stellar disc are substituted for the velocity dispersion gradients occurring in the asymmetric drift Jeans equation. The resulting equation is then ...
1.Our galaxy, the Milky Way, has a diameter (proper length) of about 1.2 105 light-years. As far as an astronaut is concerned, how long (in years) would it take to cross the Milky Way, if the speed of the spacecraft is 0.99549c?2.A law enforcement officer in an intergalactic "po...
MAPPING THE STELLAR STRUCTURE OF THE MILKY WAY THICK DISK AND HALO USING SEGUE PHOTOMETRY We map the stellar structure of the Galactic thick disk and halo by applying color-magnitude diagram (CMD) fitting to photometric data from the Sloan Exten... JTAD Jong,B Yanny,HW Rix,... - 《Astrop...
if you ran beside the football at the same speed, 60% the speed of light, you would always measure the length to be 12 inches. This is no different than you standing still and measuring the football while holding it. if a lady running with the football measured a ruler that you are ...
What is the size of the sun's diameter in kilometers? How long was Apollo 11 in space? How many stars are in the Milky Way Galaxy? How big is the Sombrero Galaxy? What is the speed of light in space? What are the distances of all planets from the Sun in scientific notation and ...
Light on its way through a liquid: In case of a transparent liquid (left) light paths are straight lines. In case the liquid is made opaque through nanoparticles (right) light paths get more complicated through scattering. Some of the paths become longer, others shorter - on average though ...
Then, in principle at least, observers living in a typical galaxy (like our Milky Way) may “see” a different universe than those following the smooth Hubble expansion. Such an apparent effect should be local of course, since peculiar velocities are expected to fade away as we move on to...
Solar cycle, period of about 11 years in which fluctuations in the number and size of sunspots and solar prominences are repeated. Solar cycle 25 began in 2019 and will reach maximum in 2025, but that maximum is predicted to be weak, like that of solar c