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.

Filter by
Sorted by
Tagged with
14 votes
5 answers
4k views

Why can't a half-illuminated planet support life at all?

Here is my own translation of the Polish version of the Drake equation article in Wikipedia: (...) They must provide the right amount of heat. The smaller the star, the less heat it gives off and the ...
trejder's user avatar
  • 251
0 votes
1 answer
38 views

Determining Stellar Activity

I've been into exoplanets and the search for life for a few years now, but I'm still very much an amateur. The basics are fairly easy: habitable zone adjusted for planet/moon mass, no brown dwarves (...
Kazon's user avatar
  • 587
2 votes
1 answer
143 views

Is life (as we know it) even possible around M-class stars?

My Question is about the fascination in looking for life on M class or Red Dwarf stars. We all know that Most stars (70%) are M Class, so looking at those stars is going to be important. The "...
Thomas Jones's user avatar
1 vote
0 answers
43 views

Why are total solar eclipses possible (probability wise) [duplicate]

Total solar eclipses are possible because the Moon is about 400 times smaller than the Sun and also 400 times closer than it is. In any planetary system, the odds of this should be near zero. Is there ...
Rohit Pandey's user avatar
0 votes
1 answer
116 views

If E.T. alien civilizations exist, won't those exoplanets be almost the age and rate of progress as ours? [closed]

This question is posed also as a mini theory, although I am really asking if someone knows how some parts of our universe would be far-more advanced if "everything" started at the same time (...
Dr. Deshando's user avatar
2 votes
1 answer
94 views

Conditions on Earth when Mars was warmer, wetter & had a thicker atmosphere

To the question, What part of a star's habitable zone has the best chance of developing life?, I made the following comment: It's always intrigued me as to why some people have thought that life in ...
Fred's user avatar
  • 2,169
2 votes
2 answers
205 views

Effects of other planets on life on Earth

I've heard this often in the media, that the gas planet Jupiter has a significant effect upon life on Earth - by, the say, drawing asteroids & comets to itself, many planet-killer are destroyed as ...
Agent Smith's user avatar
1 vote
1 answer
94 views

Is it possible to estimate the body-shape of intelligent life just by taking into account the physical conditions of a planet? [closed]

I wonder if one can estimate the body-shape of intelligent life (comparable to humans) living on land just by taking into account the physical conditions of the planet. With intelligent life (...
Daniel's user avatar
  • 29
1 vote
2 answers
96 views

Can it be possible to get ice from other moons?

Could it be possible to send out something similar to a probe to one of the moons in the solar system that most likely have water under the cover of the ice and then bring back tests to Earth to see ...
schrodingerscat's user avatar
15 votes
7 answers
11k views

How did the Milky Way quasar not disrupt life on Earth?

According to most sources of information I have found (A Quora answer and books), when galaxies become quasars, they destroy all life in their host galaxy, as they output so much radiation that they ...
Furious Arcturus's user avatar
4 votes
0 answers
39 views

M Dwarf radiation and habitability at the terminator of a tidally-locked planet?

I know that M Dwarf stars emit intense solar flares, which is thought to pose a potential problem for the emergence of life on planets that orbit them. But I was wondering if the life that might exist ...
Elhammo's user avatar
  • 1,087
2 votes
1 answer
259 views

Have there been any searches for extraterrestrial life which doesn't require water, oxygen and carbon?

This is question is similar to this, but that question has already been voted to be closed. I will add though that I joined this website today, so I am still learning how to write a good question here....
Ed_Gravy's user avatar
  • 317
2 votes
1 answer
158 views

Life forms on planets not requiring water and oxygen as basic building blocks [closed]

When scientists explore other planets such as Mars, they look for life derived from water and oxygen (correct me if I am wrong) with a purpose to see whether that planet is habitable for humans or not....
Ed_Gravy's user avatar
  • 317
2 votes
0 answers
55 views

Are the human-made devices on Mars searching for existing life?

According to the answers to my other question - Most powerful microscope on Mars? The microscopes on Mars do not search for life. SHERLOC (Scanning Habitable Environments with Raman & Luminescence ...
Joe Jobs's user avatar
  • 537
2 votes
0 answers
58 views

What would be the noticeable effects (if any) if the Earth's orbit entered a chaotic trajectory?

To set the stage, let's put some more specific assumptions: I am specifically thinking of a binary-single type interaction where the Earth is the intruder on a binary system of two bodies of a ...
Justin T's user avatar
  • 3,404
1 vote
1 answer
222 views

Calculating "maximum" distance to an alien civilization

I'm planning on making a video related to Fermi Paradox, and I've used Omni Calculator's Alien Civilization calculator as a reference. I noticed they have a field that calculates the "maximum&...
OptimusePrime's user avatar
3 votes
1 answer
146 views

Most powerful microscope on Mars?

From all the missions sent to the surface of Mars, do any of them have a microscope? If yes, then which one has the most powerful microscope? Is it capable of detecting microbes?
Joe Jobs's user avatar
  • 537
3 votes
1 answer
472 views

Could life develop in a galaxy with a quasar at its centre?

Quasars are a type of Active Galactic Nucleus that inhabit the centres of some galaxies. They are among the most energetic objects known in the universe, emitting up to a thousand times the energy ...
Dave Gremlin's user avatar
  • 1,071
1 vote
2 answers
84 views

Detection of the existence of any extraterrestrial life

We can't see things in "real-time" but we see the "past versions" of the things because it takes time for the light from that object to travel to us. So looking far away means ...
ShivCK's user avatar
  • 113
3 votes
0 answers
49 views

Could the timing of the oxygen spike on Mars be used to determine if photosynthesis is responsible?

I am wondering if the timing of the oxygen spike on Mars could be used to determine if photosynthesis is the source (which would be another indication of life on Mars), or if it is purely heat related?...
Jonathan's user avatar
  • 4,375
7 votes
1 answer
154 views

Has SETI searched the solar system for life?

I know SETI is searching the stars for radio signals emitted by advanced alien civilizations, but has SETI searched inside our solar system - particularly moons, planets, and Lagrange points? I would ...
Jonathan's user avatar
  • 4,375
1 vote
1 answer
84 views

Is life possible on other celestial objects (apart from planets) even theoretically? [closed]

For example, asteroids, comets, stars, heliosphere etc?
Abhay's user avatar
  • 83
2 votes
0 answers
55 views

Would Atlas Pro's prediction about the color of plant in Kepler-186F work as a biosignature to search for life?

The Atlas Pro video that prompted this question is this. Tl;dr: it is argued that due to the different spectrum of radiation emitted by Kepler-186 and what is known about the evolution of ...
Rubén Crespo's user avatar
9 votes
2 answers
2k views

What is the probability of life having developed or going to develop in our solar system another time?

I'm sorry I am not quite sure this question satisfies this point: Questions that are purely hypothetical, for example a question such as 'Could a black hole destroy the universe' or 'What if our ...
steros's user avatar
  • 199
8 votes
3 answers
3k views

Could rogue planets harbor life?

On July 21 at 10 am, Seti Talks will be discussing the topic of "Could Rogue Planets Harbor Life". Supposedly there are 50 billion such planets in the Milky Way. I would think that the ...
Peter U's user avatar
  • 1,619
0 votes
3 answers
857 views

How big can a planet get, with respect to its star for it to sustain life? [closed]

Earth is 108 times smaller than the sun in terms of its diameter while Jupiter is 10 times. Assuming Jupiter was located such that it could sustain life, theoretically how big a planet can get with ...
Abhay Bhai's user avatar
19 votes
1 answer
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 ...
uhoh's user avatar
  • 31.2k
4 votes
1 answer
193 views

Is there any "scale" for measuring salinity of extraterrestrial water?

Continuation of Is the water underneath Europa's ice cap potable? The referenced question discussed if water from Europa's ice caps is potable or not and from the answers, it was gathered that ...
Nilay Ghosh's user avatar
  • 4,436
0 votes
1 answer
183 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 ...
Peter U's user avatar
  • 1,619
5 votes
1 answer
86 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 ...
Michael James's user avatar
3 votes
1 answer
103 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 – ...
Infinity Milestone's user avatar
3 votes
1 answer
103 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 ...
Jack R. Woods's user avatar
1 vote
0 answers
67 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 ...
Tim Campion's user avatar
2 votes
0 answers
58 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 ...
usernumber's user avatar
  • 17.5k
2 votes
0 answers
219 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 ...
Greg's user avatar
  • 159
3 votes
1 answer
331 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 ...
yellowcat's user avatar
3 votes
1 answer
170 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.
Daosof's user avatar
  • 248
3 votes
2 answers
324 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 ...
Peter U's user avatar
  • 1,619
0 votes
1 answer
222 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 ...
C.Calvert's user avatar
  • 101
5 votes
1 answer
238 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 ...
Valdegg's user avatar
  • 51
6 votes
1 answer
340 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 ...
JuanCa's user avatar
  • 113
3 votes
3 answers
209 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 ...
Shiz's user avatar
  • 165
4 votes
4 answers
815 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? ......
user avatar
3 votes
1 answer
275 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 ...
user avatar
3 votes
1 answer
796 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 ...
Muze's user avatar
  • 1
1 vote
3 answers
170 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 ...
Matt Dee's user avatar
2 votes
4 answers
309 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 ...
Jake Geo's user avatar
3 votes
0 answers
76 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 ...
Ovid's user avatar
  • 131
3 votes
1 answer
705 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 ...
Muze's user avatar
  • 1
6 votes
1 answer
2k 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 ...
Muze's user avatar
  • 1