The escape velocity, V is the speed required to get away from the gravitational influence of a planet and it is given by the formula V=SQRT(2GMplanet/R) where is the distance from the center of the planet, Mplanet is the mass of the planet, and G is a number called the Gravitational constant. The escape velocity from the surface ...continues
A main sequence blue star, called the Blue Phoenix, has a mass of more than 50 Msun, and is in a circular orbit about the center of the Galaxy. Also the Blue Phoenix is a distance of 20,000 L-Y from the center of the Galaxy and it's orbital speed is estimated at 280Km/sec. How many years will it take for this bright star to comp ...continues
Calculate local sidereal time for noon on December 4 in Green Bank West Virginia USA.
I need a formula to solve a problem and don't know which one to use.
The gas shell of a planetary nebula is expanding (away from the central star) at 20 km/s. The nebula currently has a diameter of 1 light year. What is the age of the planetary nebula(time since the gas was ejected).
If Saturn's rings are not solid, why do they look solid when viewed through a telescope?
During the planning stages for the Pioneer 11 mission, when relatively little was known about Saturn's rings, it was proposed to have the spacecraft fly through the Cassini division. Why would this have been a bad idea?
Thermonuclear Fusion on the Sun
If thermonuclear fusion in the Sun were suddenly to stop, what would eventually happen to the overall radius of the Sun? Justify your answer using the ideas of hydrostatic euqillibrium and thermal equillibrium.
at what will the crab nebula cross the celestial median on March 12 and 13 2005. The right ascension is 05 31 30 and declination is 21 59 00.
time an object crosses the meridrian
at what time will Galaxy -Cygnus A cross the celestial meridian (along north-south) direction on March 12 and 13 2005.
description of planet retrograde motion
How can planet retrograde motion be explained by the Earth-center hypothesis and by the Sun-center hypothesis
