<h3>A. Some or all have been united at different times.</h3>
Answer:
Explanation: The only real solution is to have a large automated labor force moving materials from Venus to Mars to make Mars large enough to kick start it's own magnetosphere and natural life cycle processes. The solar winds could potentially be harnessed to travel back and forth while stripping materials from Venus to Mars.
The sun makes the air masses worm
Although the light year is a
commonly used unit, astronomers
prefer a different unit called the parsec (pc). A parsec, equal to 3.26
light years, is defined as the distance at which 1 Astronomical Unit subtends an
angle of 1 second of arc (1/3600 of a degree) When we use the parsec for really
large distances, we often put a prefix in front of it - like kiloparsecs (kpc),
which are equal to 1000 parsecs - or Megaparsecs (Mpc), equal to a million
parsecs.
The Milky Way is about 1,000,000,000,000,000,000 km
(about 100,000 light years or about 30 kpc) across. The Sun does not lie near
the center of our Galaxy. It lies about 8 kpc from the center on what is known
as the Sagittarius arm of the Milky Way.
Because it possesses a climate different than the land below, making it seem like an island.
