Questions tagged [atmosphere]

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

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7
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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
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1answer
131 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 ...
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250 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
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1answer
107 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 ...
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350 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?
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697 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
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1answer
369 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?
9
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1answer
441 views

When Chang'e-3 landed on the moon, did LADEE notice?

The Lunar Atmosphere and Dust Environment Explorer (LADEE) entered lunar orbit 2013-10-06, and Chang'e 3 landed 69 days later producing dust and gas on 2013-12-14. These were both quite interesting ...
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2answers
691 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 ...
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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 ...
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4answers
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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 ...
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2answers
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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? ...
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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 ...
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1answer
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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 ...
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1answer
172 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 ...
3
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1answer
877 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' ...
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1answer
591 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?
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2answers
282 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 ...
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1answer
364 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?
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Why is the Aeolus space laser losing power so quickly?

The BBC News article Aeolus: Wind-mapping space laser is losing power says that Europe's Aeolus satellite was launched last year to gather data to improve weather forecasts, and its observations ...
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55 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 ...
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4answers
785 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 ...
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1answer
100 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 ...
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2answers
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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 ...