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Astronomy | Astrophysics
The brightest star in the sky is the star sirius. It is 2.64 pc distant, and has an apparent visual magnitude of mv= -1.4. If the pupil of the human eye has a diameter of 5mm, how many photons from sirius enter the eye per second?
Astronomy | Astrophysics
Describe a transfer orbit from earth to Neptune. Assume that both earth and Neptune have circular orbits , with radii equal to the semi major axes of the respective planets . Of course the transfer orbit is elliptical. Knowing that Neptune's semi major axis is 4497.1*10^6 km and the mass of Neptune over the earth is 17 and the eccentricity of Neptune is .01 determine the following: the semi major axis of the transfer orbit, the speed of a satellite in earths orbit, the speed of the satellite as it enters the transfer orbit, the change in speed needed to enter the transfer orbit, the speed of the satellite as it prepares to leave the transfer orbit, the speed of the ship as it enters Neptune's orbit, the change in speed needed for the satellite to leave the transfer orbit, the travel time of the satellite in years, and the position of Neptune for launch opportunity- in degrees to be traveled.
Astronomy | Astrophysics
What is Neptune's semimajor axis of the transfer orbit if the semimajor axis is 4497.1*10^6 and the mass of Neptune over the Earth is 17 and the eccentricity of 0.01?
Astronomy | Astrophysics
why, the pluto is not one of the eight planets of solar system .
Astronomy | Astrophysics
A robot probe lands on a new, uncharted planet. It has determined the diameter of the planet to be 8 * 10^6 m. It weighs a standard 1 kg mass and determines the 1 kg weighs only 5 newtons on this new planet.
Astronomy | Astrophysics
A moon orbits a planet At a distance at 1.16 million km. The moons orbital period about the planet Is 24.4 days. What is the mass of the planet? [Assume that the moon's mass is negligible compared with that of the planet, and use the modified version if Kepler's third law.]
Astronomy | Astrophysics
Use Newtons Law of gravity to Calculate the force of gravity between you and Earth. Convert your answer, which will be in Newtons, to pounds using the conversion 4.45 N = 1 pound. (Assume that your mass is 59 kg.)
Astronomy | Astrophysics
The current mass of any star is the same as the mass it had when it first became a protostar. Does this make sense?
Astronomy | Astrophysics
the asteroid has a mass 7.395x10^20 kg and a radius of 539.7km. what is g on the surface? the value of the universal gravitational constant is 6.67259x10^-11 N*m^2/kg^2
answer in units of m/s^2
answer in units of m/s^2
Astronomy | Astrophysics
If an alien space craft was passing by our solar system when the bomb was dropped on Hiroshima, could it have detected that blast from say one light year away?
