Suppose we discover a super-Earth at a distance of 10AU from its star. Should we consider it to be potentially habitable?
A) Yes, its atmosphere may contain substantial amounts of greenhouse-type gases that can keep the planet warm beyond the usual boundaries assumed for habitable zones.
B) Yes, because its host star must be much bigger in order to have a super-Earth, so it will be much hotter there.
C) No, only planets at approximately 1AU will ever be potentially habitable.
D) No, greenhouse gases freeze-out at those distances.
Question 2
Collisions between galaxies is thought to
A) have stopped about 5 billion years ago.
B) be commonplace.
C) have never occurred.
D) be extremely rare.
E) have only occurred between 10 and 15 billion years ago.
From space earth shows itself as a planet covered mostly by water.
Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving the Earth
energy of interaction and distance of particle
Precession of Earth
Earth-Moon-Sun Positions during the Spring Tide
Humans are related to Earth’s other organisms