Questions tagged [protection]

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47
votes
2answers
11k views

Why is gold used in space technology to protection from heat radiation?

AFAIK, NASA and others are using mainly gold to protect surface from heat radiation. But, as we can see with our own eyes, chrome or silver had probably a much better albedo, because they are white, ...
28
votes
1answer
2k views

How is the Hubble main mirror protected from debris?

The Hubble Space Telescope recently hit 25 years in space. It orbits at ~550 km altitude (limited by the altitude the shuttle could reach to service it) and has sustained minor/trivial exterior ...
10
votes
1answer
2k views

Have liquid cooling systems been tested for reentry surfaces?

A tough exterior of heat-dissipating material is generally used for reentry modules. I am wondering if there have been any attempts or experiments at using liquid cooling systems as thermal protection ...
13
votes
5answers
5k views

What maximum speeds can be expected from meteorites?

Yes, I know, c is the limit, but let's say we want to build a shelter that will be meterorite-impact-proof, on the Moon, or some asteroid or anywhere without the atmosphere. We can spot anything ...
13
votes
2answers
713 views

What level of protection is required for spacewalkers?

If you're going on a space walk, you need to be shielded from cosmic rays, temperature, and possibly other issues. What components of cosmic rays are dangerous? What sort of protection is used to ...
2
votes
2answers
215 views

Is exposure to cosmic radiation more dangerous on some body parts than on other?

Radiation causes genetic mutation and every (human) cell in our body have the same genes. But on Earth we don't get cancer as often in the foot as in the genitals or in the brain. Some parts of our ...