A granite block is mostly empty space because the atoms in the granite are
A) in perpetual motion.
B) mostly empty space themselves.
C) held together by electrical forces.
D) not as close together as they could be.
E) invisible.
Question 2
A planet orbiting the Sun has speed v = (GM/d). Escape speed from the Sun is v = v(2GM/d), where G is the gravitational constant, M is Sun's mass, and d is the distance from the Sun.
Noting that this tells us that escape speed is 2 times orbital speed, which planet would fly out of the solar system by a 1.5 increase in orbital speed?
A) Mercury.
B) Venus.
C) Earth.
D) all of the above
E) none of the above
Russian federation stamp illustrating Yuri Gagarin, first human in space
A 1998 false-colour near-infrared image of Uranus showing cloud bands, rings, and moons obtained by
The Pleiades, an open cluster of stars in the constellation of Taurus. These stars share a common mo
A Connection to Interstellar Space
Contested Space: Exclaves
Atoms