The author of the reading believes that asteroid colonization is a good choice for people, and provides three reasons of support. However, the lecturer rejects the claim made in the reading, casting doubt on all the three reasons presented in the passage.
First, according to the reading, asteroids are smaller than planets, so they have lower gravity, and it is easy for a spacecraft to land or take off. This point is challenged by the lecturer. She says that landing and taking off is easy for a spacecraft, but low gravity can cause several health problems for humans, such as weak muscles and poor bones.
Second, the author states that because of low gravity and easier landing, a spacecraft can carry more equipment, more valuable metals, and less fuel for the trip back to the Earth. The lecturer rebuts this. She explains that there is no guaranty for cost supporting and transferring. She elaborates on this by mentioning that by more precious metals, their value will decrease, and there will be not more profit for the people.
Finally, the reading passage asserts that asteroids are reachable for colonization because some of them are close to the Earth, and the trip will be easier and far faster. The lecturer, on the other hands, states this point is problematic. She points out that these asteroids orbit and might be near the Earth sometimes, and might be far away from the Earth, so returning to the Earth will be difficult.
The author of the
reading
believes that
asteroid
colonization is a
good
choice for
people
, and provides three reasons of support.
However
, the
lecturer
rejects the claim made in the
reading
, casting doubt on all the three reasons presented in the passage.
First
, according to the
reading
,
asteroids
are smaller than planets,
so
they have lower gravity, and it is easy for a spacecraft to land or take off. This point
is challenged
by the
lecturer
. She says that landing and taking off is easy for a spacecraft,
but
low gravity can cause several health problems for humans, such as weak muscles and poor bones.
Second, the author states that
because
of low gravity and easier landing, a spacecraft can carry more equipment, more valuable metals, and less fuel for the trip back to the
Earth
. The
lecturer
rebuts this. She
explains
that there is no guaranty for cost supporting and transferring. She elaborates on this by mentioning that by more precious metals, their value will decrease, and there will be not more profit for the
people
.
Finally
, the
reading
passage asserts that
asteroids
are reachable for colonization
because
some
of them are close to the
Earth
, and the trip will be easier and far faster. The
lecturer
, on the other hands, states this point is problematic. She points out that these
asteroids
orbit and might be near the
Earth
sometimes
, and might be far away from the
Earth
,
so
returning to the
Earth
will be difficult.