posted by John on .
Help with these questions.
1. Describe a disadvantage of using a telescope positioned in space.
2. What advantage is there to doing laboratory experiments on the International Space Station rather than doing the same experiments on Earth?
3. Explain why it is unlikely that erraforming of Mars will occur in your lifetime.
Can someone please help me with these 3 questions?
1. They are more expensive than ground based telescopes and either a lot more difficult or simply impossible to repair or update. Also, they are vulnerable to various forms of damaging radiation and meteors. (I suppose the ground equivalent would be earthquakes and forest fires.) Other than that, no real disadvantages. Being outside the atmosphere they see more clearly. Many cannot be pointed near the Sun, but a lot of ground telescopes can't be used on the Sun either.
Motion is no more a problem than is the fact the Earth is moving a problem for ground based telescopes.
2. Microgravity allows near perfect crystal formation and through Einstein's Equivalence Principle, we are able to conduct complex research that might otherwise be influenced by gravity.
Microgravity provides an opportunity for experimentation in a whole new quiescent environment:
* no thermally-induced convection
* no sedimentation/stratification
* no hydrostatic pressure
* reduced contact with vessel walls
3. ... I don't know.
3. This is not my area of expertise, but how can we terraform Mars, if we are have a hard time terraforming Earth? We are fouling our own ecology.
I hope this helps. Thanks for asking.