桑切斯世界波厄齐尔制胜，阿森纳客场2-1米堡
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Results tagged with the-moon
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user 429
百度 “天将降大任于斯人也，必先苦其心志，劳其筋骨，饿其体肤，空乏其身，行拂乱其所为”，先贤的这句话在习总书记身上得到了完美的印证。
Questions about Earth's Moon. Also for questions about spacecraft, manned missions, potential missions, etc. related to Earth's Moon.
4
votes
Atmosphere on the Moon
The only gases relevant to life will be oxygen, nitrogen, carbon dioxide, water vapor, and methane (not counting all the volatile compounds of CHNOPS present in trace amounts). Of those, the only one …
- 18k
3
votes
Why are there no more manned missions to the Moon?
Short answer: there has been no good reason to justify the risk and expense.
When Kennedy delivered the speech which kicked off the effort culminating in the Apollo Moon landings, there was a geopol …
- 18k
18
votes
Accepted
Why does lunar gravity decrease?
The Moon's gravity does not "decrease". The Moon is not of uniform composition. It contains a variety of materials. The different materials have different densities. These materials are not uniformly …
- 18k
5
votes
Could a steam engine work on the moon?
If you are planning to boil water at low pressure, it will happen at low temperature, which means you need an even lower temperature to condense the spent steam back to water. An efficient heat engine …
- 18k
0
votes
Is there a crewed moon lander currently (March 2019) in the works
About Apollo as a baseline:
The Apollo program and its "before the end of the decade" timeframe was driven by informed speculation about what the US could achieve in order to overtake or at least clo …
- 18k
3
votes
Why did Saturn V not head straight to the moon?
Some key points to consider:
The longer you are applying thrust against gravity, the more fuel you require.
An orbit is an orbit; low-Earth orbits, the Moon's path around Earth (or more correctly, t …
- 18k
30
votes
1
answer
4k
views
How was the Apollo lunar liftoff video transmitted to Earth?
There is video of the Apollo 15, 16, and 17 lunar modules lifting off from the Moon. I recall watching it live for Apollo 17 at least. I know the images were captured by a camera mounted on the lunar …
- 18k
22
votes
Accepted
Using command module as a lander
What you are describing was termed the "Direct Ascent" mission mode. As the Wikipedia article says, it was considered but rejected because of the large launch mass requirement.
If you think about it …
- 18k
6
votes
1
answer
441
views
What is the case for human presence on the Moon?
The Moon landings in the 1960s happened largely, if not entirely, because of Kennedy's mandate. Although Apollo started before his famous speech, it was an expensive endeavour which could have been sc …
- 18k
18
votes
How do we know the Apollo Moon landings are real?
Conspiracy theories generally depend upon an absence of critical thinking. Any reasonable debunking generally requires critical thinking to cut through the misdirections, false assumptions and flawed …
6
votes
How do we know the Apollo Moon landings are real?
The conspiracy theorists who claim the Moon landings were faked put forward a few selected artifacts of questionable provenance or authenticity and call them evidence. They interpret this "evidence" a …
4
votes
The Moon's shadow could not possibly look like this — could it?
The outline of the lunar umbra on Earth (shadow of totality) will be defined by those rays of light emanating from the very edge of the solar disk as seen from Earth which just miss the surface featur …
- 18k
2
votes
Apollo Missions - Travel time to moon
As already explained in other answers, essentially all of the distance is covered by unpowered flight - gaining altitude away from Earth while under the influence of Earth's gravity, the "upward" velo …
- 18k
40
votes
3
answers
5k
views
If the Apollo mandate were delivered today, would the mission vehicle(s) and profile be simi...
Among a variety of alternatives considered at the time, the Apollo configuration of 3-person CSM and 2-person LM, launched atop a single vehicle was considered the optimal choice for its day.
With to …
- 18k