Linked Questions

34 votes
3 answers
9k views

What does the Sun-Earth-Moon system look like from the Sun-Earth L-2 point?

The L-2 point of the Sun-Earth system is away from the Earth on the night-side of the Earth; i.e. it's always local midnight at the sub-satellite point. This is an attractive property for some ...
gerrit's user avatar
  • 11.6k
12 votes
2 answers
3k views

Are any Earth orbits in continual shadow of the Earth?

Do any orbits around Earth leave the spacecraft in permanent shadow? If not, what is the minimum amount of time that a spacecraft must be exposed to sunlight on average?
Slarty's user avatar
  • 9,333
16 votes
1 answer
5k views

What are the sources of light at L2? How will the James Webb telescope be powered?

The James Webb space telescope will be positioned very close to L2. According to JPL, Webb will have a large solar-array to power itself. I don't understand how this works, since L2 is positioned "...
Daniel Kats's user avatar
4 votes
1 answer
3k views

Is L2 at a distance where the Earth totally eclipses the Sun?

What is the furthest from the Earth that still offers a total eclipse of the Sun? Is L2 inside that distance? (I assume so due the the halo orbit that is planned but perhaps there are numerous other ...
user277093's user avatar
9 votes
1 answer
792 views

For how long do the various earth-moon lagrangian points receive sunlight each month?

Every month the earth-moon lagrangian points must be in the shade of the moon for some time For L1 and L3 probably on new moons, for L2 probably on full moons, and for L4 and L5 maybe when the moon ...
Speedphoenix's user avatar
  • 5,324
7 votes
1 answer
740 views

Is the L2 Mars-Sun point protected from solar radiation?

To what extent is the L2 point protected in comparison to the surface, if at all? Since the L2 point might be in the umbra of Mars, it could be shielded against the sun. It would also be helpful if ...
Talr's user avatar
  • 71
5 votes
1 answer
723 views

Can a Space Telescope orbit so it was always in the shadow of the Earth?

Imagine you have a space telescope that had temperature sensitive instruments. (Like the Spitzer Space Telescope). In order to maintain a cool temperature - you want it always to orbit in the shadow ...
hawkeye's user avatar
  • 359
1 vote
1 answer
263 views

What is the darkest orbit around Earth?

What orbits around Earth has the least and most sun light exposure? I wondered: When taking pictures either of Earth or otherwise with various telescopes in orbit, does it help to be in Earth's ...
Muze's user avatar
  • 1
3 votes
1 answer
139 views

Does curiosity's RTG generate neutrons as this NASA CheMin X-ray detection system webpage suggests? If so, how?

mars.nasa.gov's CheMin for Scientists (found here) says (about half-way down): Detection of X­-ray Photons by the CCD CheMin will use a 600 × 600 E2V CCD-224 frame transfer imager operated with a 600 ...
uhoh's user avatar
  • 149k
0 votes
1 answer
227 views

How can back shield of JWST be 85-100 degrees Celsius hot if it will be in Earth's shadow?

I have heard, that back shield of James Webb space telescope will be as hot as 85-100 degrees of Celsius. But how can it be, if it will be in Earth's shadow in L2?
Dims's user avatar
  • 733