We’re rewarding the question askers & reputations are being recalculated! Read more.

Questions tagged [atmosphere]

Questions regarding an envelope of gasses surrounding a celestial body held in place by the body's gravity.

Filter by
Sorted by
Tagged with
5
votes
1answer
1k views

Re-entry Dynamics

I've been reading around a lot and I haven't been able to find any clear explanations. Maybe I'm a bit confused or maybe I am just looking in the wrong places. My question is, what are some basic ...
11
votes
1answer
413 views

Do atmospheric tides have any impact on orbiting satellites or rocket launches?

Wikipedia has an article on atmospheric tides but it is mostly earth based considerations. I was wondering if they have any impact on satellites or rocket launches? We know that satellites in Low ...
11
votes
1answer
280 views

Are there microclimates with better weather conditions on Mars?

On Earth, a microclimate mostly refers to an area which differs from the surrounding areas in temperature or humidity. And what about Mars ? Are there places with atmospheric conditions that are ...
8
votes
1answer
1k views

Limits of bypass ratio in air-augmented (ejector-jet/ducted) rocket

Air-augmented rockets have not historically been very successful. In most cases, adding a shroud around the outside of an existing rocket was a large weight cost in exchange for only a modest increase ...
6
votes
1answer
139 views

Could metal sulfates stay in the sulfuric acid layer of Venus?

For cyanobacteria metal ions like K+, Mg+ and other essential nutrients like phosphorus are vital for growing and to expand. So they could only thrive in the clouds of Venus if at least metal ions ...
6
votes
1answer
261 views

Apparent temperature Mars

Apparent temperature is the temperature equivalent perceived by humans, caused by the combined effects of air temperature, relative humidity and wind speed. There are several ways of measuring it, ...
6
votes
1answer
123 views

Does exploration of Venus' atmosphere now require any planetary protection protocols?

This answer quotes Marc Rayman's August 21, 2018 Dawn Journal entry: Not all solar system bodies need such protection. The Moon, Mercury and Venus, for example, have not been of interest for ...
5
votes
1answer
357 views

Could increased atmospheric pressure act as a countermeasure for effects of microgravity?

Are there any possibilities to counter the negative effects of low or micro gravity by increasing the atmospheric pressure?
4
votes
1answer
735 views

How long would a blimp last in Venusian atmosphere at an altitude of 65 km?

It would be the same blimp on Earth, except with some modifications like anti-corrosion coating. The blimp will use helium as the gas to keep it aloft. Would it last long enough to be useful?
3
votes
1answer
399 views

How to produce oxygen out of Venusian atmosphere's carbon dioxide?

What are the possible methods of in-situ extraction of oxygen from the atmosphere of Venus, which is mostly carbon dioxide?
1
vote
2answers
321 views

Atmosphere on the Moon

Question: How would you make a breathable atmosphere in an artificial closure on the Moon? I originally thought that simply obtaining water from the Moon, sending an electrical current through it to ...
10
votes
2answers
2k views

How much sulphuric acid is on Venus?

According to Wikipedia there are just 150 ppm of sulphur dioxide and 20 ppm of water in Venus' atmosphere. At the same time it is known that there is a considerable amount of sulphuric acid in the ...
9
votes
2answers
693 views

Would an orbital Deep Space Network be more efficient?

Deep Space Network sites in California, Madrid and Canberra perform an excellent job, for example receiving from Voyager 2 (16+ billion km) at -150 dBm power. However, would it be more advantageous ...
9
votes
1answer
396 views

Is there any reason Cyanobacteria or Lichens can't survive on Mars?

According to this article "Mars atmosphere is supersaturated with water" & according to answers to this physics stack exchange question conditions do exist on the surface of Mars where fluid water ...
8
votes
2answers
2k views

Depressurization of a habitat on Mars

Wikipedia lists the atmospheric pressure of Mars to be about 600 pascals, or just 0.6% of Earth's atmosphere. I'm wondering, can anyone shed any light on what that means, in practical terms? ...
8
votes
4answers
2k views

What is the barometric formula for a gas giant?

The barometric formula describes the atmospheric pressure depending on height and a host of other things. This formula assumes a constant gravitational acceleration over the whole height of the gas ...
5
votes
1answer
2k views

Could we fly on the Moon in Xenon?

The Moon is not capable of keeping an Earth like atmosphere, nor is it practical to keep satellites in lunar orbit. Which means all transportation and communication would need to be ground based. No ...
5
votes
1answer
206 views

What will happen to gas released from the Moon's Surface?

When humans return to the surface of the Moon, there could be many circumstances under which gas is released out, from the pressurized components. Some of the cases are as follows: Gas released from ...
5
votes
1answer
203 views

Is really almost all the water in the atmosphere of Venus above the clouds?

In this question about the amount of sulfuric acid in the atmosphere of Venus it is calculated that the amount of water in it's atmosphere is $9.6 \times 10^{15} \text{ kg }$ H$_2$O. In one of the ...
3
votes
1answer
1k views

Mars' atmosphere and the triple point of water

As I understand it, the average atmospheric pressure at the surface of Mars is close to the triple point of water. Is this a coincidence or does water have some sort of controlling effect on Mars' ...
3
votes
1answer
615 views

Heavy gas artificial atmosphere on Ceres?

Is there any heavy enough gas that could be used to make an artificial atmosphere around Ceres without it escaping into space?
3
votes
1answer
188 views

Could escape velocity be achieved in the atmosphere?

When rockets launch for orbit they travel up and the air thins respectively to the speed increasing. How fast can a rocket for travel at sea level before it would fail or the elevation would have to ...
2
votes
0answers
120 views

How were Mars' zero elevation datum defined? What are their shapes?

Discussions on Boiling ponds and pools on Mars? led me to Wikipedia's Mars; Geography and naming of surface features which says: Because Mars has no oceans and hence no "sea level", a zero-...
2
votes
3answers
369 views

How much efficiency is lost from a fixed De Laval nozzle when modified for atmospheric use?

Fixed nozzles designed for vacuum are larger/broader than those designed for atmospheric or combined air/space use, which have less flanged nozzles due to the drag a larger flange would incur in the ...
2
votes
4answers
829 views

Is powered descent from orbit a viable method of reentry on bodies with an atmosphere?

Pretty much like the title says. Beyond a simple (one or more) retro burn into unpowered plummeting into the atmosphere, is some form of powered descent a viable method of reentry from orbit on ...
2
votes
1answer
444 views

What is the terminal velocity on Mars?

How would I calculate the terminal velocity of Mars? What is the terminal velocity of a balloon entering Mars' atmosphere? Would a balloon pop if dropped from space?
1
vote
1answer
107 views

What was the exact nature of the observations of “solar flare activity” that delayed the launch of Vostok 5?

The interesting story of Vostok 5 recounted in Encyclopedia Astronautica's Vostok 5 (linked in comments below this answer) includes the following passage: Vostok 5 was originally planned to go for ...
1
vote
0answers
102 views

Could not silica aerogel dramatically increase the atmospheric pressure on Mars?

In the NASA article Want to Colonize Mars ? Aerogel Could Help a study about the potential of aerogel as a building material on Mars is reviewed. In an experiment 2-3 centimeters of silica aerogel ...
1
vote
0answers
60 views

What are InSight's barometric and seismic digitization rates and frequency responses when it “listens to the wind”?

News of the "sound of the wind" on Mars is all over the internet today. If you read the fine print, it's really better described as rapid cadence barometric pressure measurements then sped up by a ...
0
votes
2answers
166 views

How will Mars terraforming missions really work, how do pioneers like SpaceX plan on conquering Mars? [duplicate]

We know Mars is now dead in the water (or space), it is now merely an oversized rock hurtling through space, with a bit of atmosphere. I was reading up on terraforming the planet, and learned that ...