Questions tagged [life]

Questions regarding life in the universe, especially the possibility of life outside our planet, or the influence of astronomical forces on life on Earth.

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1answer
5k views

Serious alternate form of the Drake Equation, or graffiti?

Where I live it is very common to see jackets and T-shirts with familiar yet casually garbled or modified content (example) I recently spotted what looked a lot like the Drake equation on the back of ...
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0answers
73 views

Is there any “scale” for measuring salinity of extraterrestrial water?

Continuation of Is the water underneath Europa's ice cap potable? Recently, there was a question which discussed if water from Europa's ice caps is potable or not and from the answers, we ...
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1answer
127 views

For colonization purposes, what is so good about Titan? [closed]

I have read that Titan is the best candidate for humans to colonize in our Solar System. However it has no water, it's atmosphere is not breathable and it is -290° F on the surface. It doesn't sound ...
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1answer
79 views

Is extra-planetary phosphine actually a new discovery?

For all the buzz on Venus’s phosphine, I’m curious as to what sets it apart from the findings of phosphine on Jupiter, Titan, etc. There are several papers on NASA.gov dating to 1979 and more recent ...
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1answer
62 views

Why is the SETI survey limited to only Red Dwarf Stars?

I was going through the official SETI website, when I came across this article on the same website which said : Today, the SETI Institute uses a specially designed instrument for its SETI efforts – ...
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1answer
93 views

What other hints of possible life in Venusian atmosphere have we dismissed?

Now that phosphine has probably been discovered in relatively large quantities in the Venusian atmosphere, I heard that there have been other unexplained phenomena (i.e. dark patches) seen. Does ...
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62 views

Is there a useful measure of how “life-dominated” a planet is?

If life exists on Mars or Venus, then in contrast to life on Earth, it must be "just scraping by". I can imagine a few ways to quantify this: Life on Mars or Venus is hard to detect -- any ...
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51 views

Could life forms have travelled between the Earth and Mars on meteoroids?

Mars meteorites have been found on Earth, and there likely are Earth meteorites that have crashed on Mars. If you take any random piece of rock from the surface of Earth, the odds are there will be ...
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118 views

On Venus, what substances are likely to be found that are liquid in the temperatures and pressures and are there pools of the stuff?

It's clear that there is no water on Venus. But with temperatures hot enough to boil lead, well, couldn't there be pools of lead on the surface? Or pools of other things, like sulfur? Is there any ...
3
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1answer
164 views

The Solar System formation

I've recently watched one conversation (I won't post a link since the conversation is not in english) involving a physicist (at least he claims so), who spoke about probabilistic estimates of the ...
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1answer
94 views

Other than liquid water what factors could make way for life to be on Europa?

I know that Europa has liquid water, but I just don't know if there is anything else on it that could give way for life.
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2answers
174 views

Consequences of strong wind on an alien Planet on the possibility of life

I was surprised to learn recently that Neptune has winds of 1500 miles an hour. My question is whether life could ever evolve on such a Planet that has such powerful winds? Not necessarily on ...
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82 views

Would it be possible for life found on moon of rogue planet

I have heard that there are at least three Basic requirement for life exist in the universe, they are: Source of Energy Complex chemistry (including solvent/medium for chemical reaction) Protection ...
5
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1answer
165 views

Will the conditions that allow life to evolve still be around in a trillion years?

Some billions of years ago, systems like the Earth couldn't emerge and therefore life couldn't arise, because not enough of the heavy elements had formed yet. Assuming there'll neither be a big ...
5
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1answer
226 views

Proxima as Supernova

Follow this question. If a star at the same distance from us as, say, Proxima Centauri had exploded as a Supernova 4 years ago (I know, it can't explode as supernova, let's say it can)... How bright ...
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3answers
161 views

Plant on large Asteroid?

I'm just curious if it is possible for a plant to survive on a large asteroid. Some say no, some say it depends. With the scenario of an asteroid at about 1 AU from the Sun, receiving a similar ...
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4answers
296 views

Could the solar system survive in a void?

If the solar system were suddenly placed in the middle of a large void... would everything still function as normal? Would we even notice any difference here on Earth apart from the night sky? ......
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1answer
142 views

Could an Earth-like magnetic field protect life at exoplanet Proxima Centauri b?

I took a look at Wikipedia's page for Proxima Centauri b, the exoplanet that orbits Proxima Centauri, where it is said it is expected to receive 2000 times of stellar wind pressures than on Earth. It ...
2
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1answer
668 views

Could Mars have oil?

What events could have to happen to Mars (which is thought to once look like Earth) that may have depleted the atmosphere and erase all proof of life ever existing at least on the surface? I know an ...
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3answers
97 views

Could some bacteria theoretically evolve to survive in space?

There is no edge to the atmosphere, and therefor I expect there would be a gradual reduction of concentrations of bacteria as we ascend into space. Logically anaerobic bacteria should be able to ...
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4answers
242 views

Why haven't detected life in the universe?

It would seem that if life were relatively common in the universe that there would be a cacophony of noise somewhere in the electromagnetic spectrum. Is life so rare and distant that the waves haven't ...
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0answers
65 views

How strong are the stellar flares on YZ Ceti?

Doing research for a game and trying to understand the implications of the stellar flares from YZ Ceti. In short (ignoring the planets for now), if people were to build large space stations of various ...
3
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1answer
327 views

Is there enough light to grow plants in the ocean of Europa?

What is the underwater temperature of Europa? I know Jupiter emits infrared light but does it emit any light able to support plant life of any type on near by Moons? Can under water volcanic activity ...
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1answer
388 views

What is the underwater temperature of Europa?

If Europa has an oxygen atmosphere with a water mantle, is it possible that there could be life under the crust of Europa ice on the ocean where it is warmer? What could be the temperature under the ...
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2answers
173 views

Life on other planets

If all living things like animals require oxygen to live, how can people think that there could be life on other planets such as mars for example ? Living things require oxygen and carbon dioxide, and ...
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1answer
86 views

How far can a planet with living beings get before we cannot see the living beings? [duplicate]

Let there be a planet with Earth-like life. However, no trash or monuments or other visible structures, just organisms. How far can that planet be from Earth before our equipment just cannot observe ...
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Whats the probability of a hazardous impact for human life on Mars?

Yesterday my sister and I have discussed the recent efforts of SpaceX to create a permanent colony on mars. When coming to the several dangers of creating a habitat on a different planet, we got ...
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1answer
111 views

Could Earth have been seeded with life? [closed]

The earliest life on Earth is thought to have began shortly after its formation (a few hundred million years after, by fossil evidence, and this while the late heavy bombardment was raging). With the ...
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1answer
128 views

What types of star do we know are hostile to life (like ours)?

Certainly all stars have enough energy for a planet to host life. But a more magnetically active star is not preferred because solar ejection could strip planets of their atmosphere. What's the right ...
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2answers
141 views

Can aliens possibly be around us?

I've heard somewhere that when we observe distant galaxies, we actually look into the past. For example, if a planet is 3 million light years away from us, it means that we observe its state as it was ...
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3answers
344 views

Can life on earth be supported by only a Red Dwarf star or a White Dwarf(state still hot not cooled enough yet)?(Provided it is near to the star)

Can a red dwarf star or a white dwarf have enough energy to support life on earth? How it will change the climate and the seasons of earth if it is our only star? (energy source)(Expecting it to ...
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1answer
74 views

Ideal conditions for life [closed]

Is Earth the perfect place for life ? If it isn't then how could conditions be better here ? For example, the size of the Planet, our atmosphere, distanace from our Sun etc.
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3answers
4k views

How close would the sun have to get to Earth for there to be severe consequences?

According to earthsky.org the Earth gets 3 million miles closer to the Sun than its usual distance of about 93 million miles on average. My question is, how close would the earth have to be to the ...
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0answers
84 views

Life in sufficiently hot rogue planets [closed]

The Milky Way has a bright center we can't see directly because of space dust. Are there's regions of the galaxy free of that dust that could receive all that light and radiation, right? Would it be ...
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2answers
445 views

How does space time differ within a galaxy?

Not the same question but is similar to other marked duplicate. How much time dilation does the center of a galaxy can exist and sustain human life from our point of view? What would a day equal to ...
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1answer
2k views

Could life survive on a planet orbiting a neutron star? [closed]

Suppose an Earth-like planet orbits a neutron star, though specifically not a pulsar. Is there any possible orbit, around any possible neutron star, in which the planet could support human life?
3
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2answers
374 views

What if we are looking for the wrong signs of life on other planets?

I am by no means an astronomy expert, having only taken 2 semesters in college. But I am an avid follower of news reports that look for signs of life on other planets. Today it was announced that 20 ...
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1answer
700 views

Why are ice giants not considered suitable for life?

Ice giants are currently not considered suitable for life due to temperature, pressure and composition. This paper gives some parameters for life in regards to temperature, pressure and composition: ...
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1answer
84 views

What questions will we be able to answer if we find life on other celestial bodies? [closed]

Will that be able to answer questions such as our origins or why we exist? Will it unlock some sort of new perception towards anything?
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1answer
92 views

Is there any plausible astronomical source of energy that could wipe out humanity without rendering the planet inhabitable?

I'm aware of hard radiations from space can wipe out life but I believe that would also causes the planet to be inhabitable for a period of time. Is there any other kind of energetic astronomical ...
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2answers
190 views

What is the probability that we are the first ever intelligent life in the whole universe? [closed]

What is the probability that we are the first ever intelligent life developed all over the universe? Everything starts somewhere, Is there any probability that we are the beginners to be part of ...
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1answer
239 views

can a life exist outside the universe? [closed]

can a life exist outside of universe. but we know that in our universe many galaxies have life without water and oxygen and it is possible that life exist outside the universe so help me to find the ...
3
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2answers
226 views

Explaining the Drake Equation on a smaller scale

So me and my friend were planning a video to explain the Drake Equation (within a time limit of 5 minutes), and we needed some help. This video is aimed at explaining the concept to an age group ...
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0answers
74 views

Could a moon of a mini-neptune around a red dwarf harbour life?

I am planning a game where on could control evolution on an alien world. I was thinking red dwarf as per here Habitable Planet around Red Dwarf To my understanding three questions arise: Tidal lock ...
4
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1answer
143 views

How early could life supporting planets been formed?

In thinking about exclusion options for where its not worth to look for habitable planets, the past came to my mind. Right at the beginning of the universe, there was no possibility for (carbon based)...
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49 views

In SETI has anyone calculated an estimate of the mean time between observations?

So the Drake Equation, proposed by Frank Drake, is often cited as a means to estimate the number of intelligent civilizations that exist in the observable universe. Initial calculations by Drake ...
2
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2answers
262 views

Life forms in brown dwarf atmosphere

Some of brown dwarfs generate the enought amount of heat to warm their atmosphere up to 300 K. This is a condition to liquid water and, possibly, organic life forms. Is where are a some studies about ...
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1answer
304 views

What programming languages does SETI (Search for ExtraTerrestrial Intelligences) most commonly use for signal processing?

Please give preference to those most widely used in the field, if possible.
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2answers
485 views

Would being ejected from the Milky Way Galaxy have any major impact on life on Earth? [duplicate]

I was reading about the impending collision of our galaxy with the Andromeda galaxy, and learned that there is a small possibility that our solar system could be ejected during the collision. ...
4
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3answers
330 views

Can life survive on the equator of cooled and fast rotating white dwarf or neutron star?

As I know, some stars produces carbon, nitrogen and oxygen when they are old and become white dwarfs or neutron stars. And even their surface gravity is strong, it may rotate very fast so that the ...