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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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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
169 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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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 ...
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1answer
115 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 ...
6
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1answer
194 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
71 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
68 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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2answers
1k views

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
93 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
64 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
124 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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2answers
87 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
63 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
236 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
72 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
235 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
786 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?
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2answers
243 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
332 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
82 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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0answers
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The gravitational effect of a neutron star in our solar system

Imagine a neutron star with a mass of $3\:M_{\odot}$ is present at $10\:AU$ from the Sun, perpendicular to the plane of the solar system. The neutron star traverses over the sun (and the solar system),...
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1answer
86 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
147 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
203 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 ...
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2answers
152 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
63 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 ...
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1answer
111 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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0answers
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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
205 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
222 views
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327 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. ...
2
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2answers
242 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 ...
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2answers
203 views

What planets and moons have we seeded with life (if any)?

Which planets and moons have we accidentally (or purposely) seeded with life? I would expect this to be any planet or moon we have sent an unsterilized (or not fully sterilized) lander to, or crashed ...
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1answer
163 views

How early/late is the human race as intelligent life in the universe/milkyway? [closed]

In the history of the universe, there has been a time, where intelligent life had no chance to develop (e.g. in the early universe, when no habitable planets have formed) and there is a time today ...
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1answer
182 views

What would be the outcome for life in our galaxy if the merger of the Milky Way and Andromeda creates a Quasar?

If predictions are correct, the Milky Way and Andromeda are set to collide in around 4 billion years. If, when this occurs, a Quasar is formed by matter being accreted to the common galactic center (...
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1answer
110 views

Red dwarf variation in Luminosity

I recently saw this video. The creator of the video says that one of the reasons for non-existence of life on planets around red dwarfs might be that these stars can increase luminosity roughly by a ...
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1answer
1k views

Could human life thrive on a planet in a pulsar star system?

Aleksander Wolszczan of Pennsylvania State University found three planets circling a pulsar called PSR B1257+12.Two of the planets were the size of Earth.The pulsar observed by Spitzer, named 4U 0142+...
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2answers
273 views

What earth organisms would survive if they arrived on Mars?

Contaminating other planets is a concern in space exploration. My question is what organisms, or small collections of organisms, from earth would be able form a self-sustaining population on Mars? I'm ...
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2k views

How many planets have we discovered that can support human life?

I have heard a lot of buzz about distant planets that could potentially be second homes for human existence, but what is that approximate number?
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4answers
332 views

Notable differences if all stars would disappear except the Sun

I am not an astronomy expert, but as of today, all other stars than the Sun have little to no effect on life on Earth. So I was thinking, would there be any differences for the Earth at all if all ...
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4answers
724 views

If we found evidence of life on Mars, how would we know that it originated on Mars rather than Earth?

Consider this scenario. One of the probes sent to Mars either very soon, or within the next century, finds conclusive micro-fossil evidence that life once existed on Mars. One theory today that is ...
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1answer
191 views

Does liquid water on Mars means life?

We need to figure if liquid water is present throughout a Mars year, and how long the planet has been at its current distance from Sun. That will give us the length of time that liquid water has been ...
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1answer
77 views

Is liquid water on Mars such a big leap compared with ice?

I thought we have found bacteria or other kinds of life on Mars. Now it is liquid water. Is there such a big difference between liquid water and iced water?
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1answer
209 views

Available energy for potential life on Titan

There is an interesting discussion about whether there could be life on Saturn's moon Titan. (For example here.) The life could use reaction of hydrogen and acetylene which are being produced by ...
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2answers
164 views

Accidental or deliberate? [duplicate]

We know that the visual size of the Sun and Moon from the Earth in our lifetime (!) is nearly equivalent. Now my question: Is this event is random? Or have a scientific reason? For example, maybe ...
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1answer
71 views

Probability of finding life-supporting exoplanets

We've found over a thousand exoplanets by now, but how many of them could support life? What percentage of newly found planets are potentially life-harbouring? Or haven't we found any exoplanets that ...
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2answers
160 views

Would dark energy save the earth for a while as the sun heats up?

Would the expansion of space (e.g. dark energy) move the earth further away from the sun over time, possibly saving us for perhaps a few billion years as the sun heats up? Scientists now tend to ...
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1answer
47 views

Are there any works discussing planetary bodies being forms of life?

I'm searching for works or individuals that consider and discuss the idea of planetary bodies being considered stand alone living creatures, rather than objects either capable or incapable of ...
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14k views

Life planets orbiting black-holes. Can/Do they really exist?

So, I watched Interstellar and if you watched it too you know that there's a planet orbiting a black-hole, they call it Miller's Planet. According to the movie, every hour on Miller's Planet is ...
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1answer
127 views

Why did Earth need material from comets to assemble the raw materials for life?

It's often speculated that matter from comets played a crucial role in the development of life on Earth. For example, Maps of Time says, Many of the ingredients of the early atmosphere (including ...