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Questions tagged [sunlight]

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16
votes
1answer
3k views

How is sunlight simulated in spacecraft testing, given its brightness?

How could a light source like the sun be approximated on Earth for testing, given how much brighter it is in space than anything else?
1
vote
1answer
129 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 ...
1
vote
0answers
75 views

Lighting an area of the Earth Surface from LEO

What does the math look like to calculate the size of an object in LEO that when angeled off the sun, would illuminate a part of the Earth's surface? For example, if I wanted to 'lightup' a square ...
5
votes
3answers
295 views

Is a sun-blocking orbit possible?

Is it possible for an orbital "sun shade satellite" to have a geosynchronous equatorial orbit such that it is in an approximately straight line between the Sun and a fixed point on the Earth's ...
1
vote
0answers
108 views

What happens to Lunar (or asteroidal) regolith if sunlight is concentrated on it?

At 24:40 into this lecture, technology development scientist Laurent Sibille briefly describes an experiment done with a regolith simulant for Lunar Mare. The process of producing oxygen and reusing ...
12
votes
2answers
2k views

Do ISS astronauts occasionally let the sunshine in for a natural light “fix”?

I looked for images of a nice sunlit ISS crew cabin interior and predictably didn't have much luck. Most hits were mentions of the sunlight the astronaut would leave behind on earth, or enjoy again ...
5
votes
1answer
401 views

Why aren't bubble helmets dangerous in direct sunlight?

I've been thinking lately about bubble helmets used by many cosmonauts and astronauts. Almost every space suit I've seen features a curved helmet, even the Gemini astronauts. But a curved piece of ...
15
votes
1answer
2k views

Can the Sun set twice during the same day on Mercury?

Mercury's day is only a little bit shorter than its orbital period, the relationship is a 3:2 resonance. However, I noticed that the planet's angular velocity at perihelion, 0.265 arc-degrees per ...
9
votes
3answers
4k views

How long will a 500 km altitude satellite spend in Earth - shade per orbit

I used to know how to do this, but for the life of me I can't remember the source of the equations. This is clearly a question of geometry rather that any specific space science however I still feel ...