The captain of a spaceship orbiting planet X discovers that to remain in orbit at from the planet's center, she needs to maintain a speed of What is the mass of planet X? (G = 6.67 10-11 N m2/kg2 )
A) 2.8 1019 kg
B) 4.2 1017 kg
C) 2.8 1016 kg
D) 4.2 1014 kg
Question 2
An atom's atomic number is
A) the number of protons in its nucleus.
B) the number of electrons orbiting the nucleus of the neutral atom.
C) Both of the above.
D) the number of electrons orbiting the nucleus of the ionized atom.
E) All of the above.
Muskox populations remain in the Arctic all year, though they migrate to higher elevations in the wi
Earth as viewed from Lunar orbit during the Apollo 8 mission, Christmas Eve, 1968. Africa is at the
Image of an Almost-Extrasolar Planet
The Orbit and Tails of a Comet
Changes in Earth’s Orbit
Biodiversity and the unevenly distribution on the planet