Questions tagged [exoplanet]

Questions regarding planets outside of Earth's solar system.

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3 votes
1 answer
163 views

Are there any modern studies for how to colonize an exoplanet involving interstellar travel?

As in the title, are there any modern studies for how to colonize an exoplanet involving manned interstellar travel? By this I mean an academic peer reviewed study. However, it doesn't have to be ...
12 votes
1 answer
3k views

Can a meteor shower have a interval greater than 1 year?

Most meteor showers are yearly events. In the manga "SoSo no Frieren" the characters experience a meteor shower that happens only once every fifty years. The story does not take place on ...
0 votes
0 answers
36 views

Most accurate method to find exoplanets?

NASA has found thousands of exoplanets in space using their powerful telescopes. How exactly does NASA do so and what is the best method? I'm assuming that NASA uses some sort of sensor to detect ...
35 votes
3 answers
25k views

When will we have the technology to directly observe an exoplanet with significant clarity?

Are there currently any projects underway to develop a telescope which will have the ability to directly observe an exoplanet with any clarity? I don't mean blurry (yet impressive) images like this ...
15 votes
5 answers
3k views

What concentration of oxygen in a planetary atmosphere would be indicative of life?

Astronomical spectroscopy can be used to determine the chemical composition of distant bodies. In the related question Can we detect atmosphere on exoplanets? we learned that, even now, we are ...
2 votes
1 answer
155 views

Why a polar orbit for TWINKLE?

TWINKLE will use a 0.45 meter telescope to record spectra of stars transited by their exoplanets. By looking at tiny changes in the spectrum as the planet's atmosphere moves in front of the star, they ...
1 vote
0 answers
120 views

What are opinions of most planetary scientists on this study (link below), were there already some complex reviews in scientific journals? [closed]

I remember this two year old article from Universe Today https://www.universetoday.com/144402/science-fiction-might-be-right-after-all-there-might-be-breathable-atmospheres-across-the-universe/ about ...
4 votes
1 answer
62 views

Exoplanet orbitable in permanent umbra?

Does any planet, or Kuiper Belt Object, or exoplanet measured or surmised, orbit its star either fast enough, or slow enough and thus distantly enough to cast a long enough shadow, for a spacecraft to ...
2 votes
1 answer
118 views

How to obtain salt from exoplanets

Is there any way to artificially make salts for humans colonizing planets on a long term basis? It is given that the exoplanet has a water source. So do we hope for the best that it has salt present ...
10 votes
3 answers
1k views

Agriculture on an exoplanet

If we find a hypothetical Earth-like planet A with a rocky terrain that we could colonize, how would we go about planting the first plants, knowing that there is a deficient of nutrients and the ...
2 votes
1 answer
105 views

What will (likely) be the first separately-orbiting coronagraph to be deployed in space?

Traditionally a coronagraph is something that blocks the bright disk of our Sun to make it easier to image the much dimmer corona. The first coronagraph is of course the Moon; during a solar eclipse ...
1 vote
2 answers
129 views

Any star-system list indexed by proximity?

Does anyone know where I can find a list indexed by Earth-proximity with all the star-systems or exo-planets with appropriate conditions for human direct exploration? It is not necessary to have ...
8 votes
4 answers
2k views

Dark side of an exoplanet - if it was earth-like would its surface light be detectable?

The Kepler telescope looks at dark sides of exoplanets. If the exoplanet was earth-like would it not have emitted light? Would those lights be detectable, or what technological advances would be ...
1 vote
0 answers
48 views

Future plans and advances for improved extrasolar planet imaging; has anything changed since 2019?

I have seen What is the state of the art of exosolar planet imaging in 2019? but answers there simply address the types and quality of images. Here I'd like to ask about plans for future technology to ...
1 vote
0 answers
57 views

Do black holes emit enough heat to heat a planet? [closed]

Under what circumstances can a blackhole emit enough heat to allow life on an orbiting planet?
3 votes
1 answer
77 views

Apsis suffix for object orbiting an exoplanet

Is there already an agreed upon apsis suffix for an object orbiting an exoplanet? I don't think it's super likely that there is, as I don't think any moons have been discovered (or at least not at a ...
9 votes
1 answer
589 views

Can there be an atmosphere in a cave on an atmosphere-less planet?

I am making an exoplanet for a game and was wondering whether a planet without an atmosphere (or at least with a very weak atmosphere) could support caves that do have an atmosphere, or whether the ...
16 votes
3 answers
4k views

If Saturn or Jupiter were in Earth's orbit, would any of their moons be habitable for humans?

The majority of exoplanets found so far are comparable in size to Jupiter or Saturn. Which, as we know, are problematic for human habitation. But their moons have a lot of potential. Some of these ...
1 vote
1 answer
102 views

What radio signals have NASA transmitted to outside our solar system?

What radio signal have NASA transmitted to outside our solar system and what did they contain?
1 vote
3 answers
1k views

Are exoplanets in the habitable zone suitable for human colonization?

If they found the those planets in the habitable zone, are they planning ahead for human settlement of them?
5 votes
1 answer
235 views

Why are all possibly habitable exoplanets higher mass than Earth?

I have been writing a scifi book in which I wanted to include real stars and planets as locations. It was simple enough to find a chart on Wikipedia that lists possibly habitable exoplanets, but I ...
6 votes
2 answers
854 views

Could the James Webb Space Telescope detect chlorophyll on a exoplanet?

Say there's an exoplanet identical to Earth 20 light years away, and also assume it orbits at an angle so that it transits its star when seen from our solar system. Would the JWST be able to detect ...
6 votes
1 answer
269 views

What is the most accepted explanation to the Fermi paradox by the scientific community? [closed]

If there is no "most accepted" explanation, then what would be the most scientifically probabilistic explanation to the Fermi paradox? The Fermi paradox, named after Italian-American physicist ...
21 votes
2 answers
4k views

Are images of exoplanets' surfaces technically possible?

While already even taking an image of an extra solar planet sounds like science fiction to me, is it technically possible by what we know now to take also more detailed images of extraterrestrial ...
1 vote
0 answers
38 views

What fraction of stellar systems could/can Kepler and TESS search for planets?

Since Kepler and TESS search for exoplanets by their transit in front of their host stars, they can only find planets around stars whose ecliptic plane is nearly edge-on as seen from Earth. (Ref 1 &...
0 votes
0 answers
50 views

Which of the upcoming space missions has the greatest chance of proving the existence of life on exoplanets?

Confirming the existence of life on other distant planets would be one of the greatest discoveries in our history. I believe that many space enthusiasts would love this to happen in the coming decades....
1 vote
1 answer
126 views

Is it possible to force atmosphere onto a non atmospheric planet?

If you had some way of injecting large masses of gas into a small planets gravitational field, would it form an atmosphere? You would have to pump it at an extreme rate but would it still work if the ...
3 votes
1 answer
73 views

Alternatives to an ozone layer

Our home planet earth has low concentration of ozone in its atmosphere, protecting it from UV radiation, could Exoplanets share the same method but have a different gas in the atmosphere which has a ...
2 votes
1 answer
83 views

What is the state of the art of exosolar planet imaging in 2019?

I have seen this question from 2013 asking if it's possible to take pictures of extrasolar planets. But I am wondering if anything has changed since then. Have we taken higher quality images of other ...
1 vote
0 answers
57 views

If humans move to different solar systems will they eventually evolve into different species? [closed]

I once read an argument against space settlement in a newspaper that said that if humans move to different systems eventually they will evolve into different species, or their cultures and beliefs ...
30 votes
2 answers
749 views

Which of the planets could we detect today from just the movements of the sun?

Assume that despite our current level of space exploration and technology, we have somehow missed the existence of the other planets in our solar system. We have developed various methods of ...
5 votes
3 answers
1k views

When will we be able to conclusively confirm or disprove Bode's law?

I am reading Heinlein's Time for the Stars(1956) and some of the characters are very excited about confirming Bode's law. The formula suggests that, extending outward, each planet would be ...
8 votes
1 answer
1k views

How to calculate density of unknown planet?

Having approached an unknown planet, a spaceship went in a low circular orbit. Would astronauts be able to determine the average density of the planets using only a watch
7 votes
1 answer
619 views

Can we make super-massive Telescopes to image exoplanets?

This question has already been partly addressed here: When will we have the technology to directly observe an exoplanet with significant clarity? However, my question is focused more on the ...
-2 votes
1 answer
1k views

What is the origin of Black knight satellite? [closed]

Is it true that an extraterrestrial satellite orbits earth in retrograde? If the Black knight exists, can we presume that it is placed there by aliens who are technologically more advanced than ...
1 vote
1 answer
87 views

can we estimate the number of habitable planets within a specified distance from Earth?

For the purposes of this question, I will define "habitable" as: rocky composition like Earth about the same surface gravity as Earth (about 1 G) orbiting a relatively quiet star, like our Sun far ...
15 votes
2 answers
2k views

Why would Kepler rotate towards Earth to transfer data?

A question from here: "Why would Kepler rotate towards Earth instead of having an antenna always directed to Earth"?
5 votes
4 answers
1k views

Could a 21 meter space telescope detect the nearest exoplanets?

For reference, Hubble's mirror is 2.4 meters wide, the upcoming James Webb's 6.5 meters, and the proposed ATLAST 8 or 16 meters. Let's assume a mirror nearly ten times Hubble's size, 21 meters, is ...
2 votes
2 answers
492 views

How could I find a potentially habitable exoplanet in same direction as Kepler-186f?

I am working on a story where a spaceship is on a mission to colonize the exoplanet Kepler-186f. However, after hitting of small meteor, they need to find a closer candidate for the new colony. I want ...
8 votes
1 answer
474 views

The physics behind the Starshade

The Starshade is a space telescope with a large occulter that can fly off and block the light of a star so its telescope can picture the surrounding exoplanets: I ...
5 votes
2 answers
188 views

Are there orbits for a starshade and a telescope to stay linear to an interstellar object?

Does there exist two orbits synchronized so that a telescope in one would line up with a star shade in the other on a line pointing to a certain star? And this during a period of time relevant for ...
3 votes
3 answers
714 views

Could a terrestrial planet with a hydrogen atmosphere be habitable?

Many exoplanets, even small ones, have densities so low that it indicates that they have hydrogen atmospheres. Is a hydrogen gas atmosphere of a terrestrial planet somehow detrimental to biology as we ...
3 votes
1 answer
280 views

Smallest planet where human type life could evolve and survive?

Most exoplanets making the news are larger than Earth. I wonder about the smaller worlds, how small is too small? Reword to keep the question narrow enough to be answerable. When the Earth was ...
6 votes
2 answers
2k views

Why is TRAPPIST-1f considered habitable?

The TRAPPIST-1f is in the TRAPPIST-1 system discovered recently with seven planets. Three of them are said to be in the habitable zone. But the data says that the average temperature on the TRAPPIST-...
1 vote
1 answer
174 views

What are the chances of life on 7 Earth-like exoplanets discovered by NASA? [closed]

NASA has announced the discovery of 7 Earth-like exoplanets 13 hours ago. What are the chances of life there? Is it possible to see the ground of these planets from here? How far are they?
9 votes
1 answer
480 views

A Jupiter-sized star?

TRAPPIST-1 is described as "Jupiter-sized" (comparable radius), although at 8% of the Sun's mass, must be on the order of 100x greater (Jupiter : Sun is about 1 : 1000). This seems paradoxical and ...
4 votes
0 answers
93 views

Resonances and the seven sisters recently discovered

In reference to the discovery of seven planets around Trappist-1, I'm just wondering if any of these planets are in an orbital resonance and if that is the case, what the implications for habitability ...
2 votes
1 answer
202 views

Exoplanet(s) that share orbit?

Has Kepler (or any other survey) found an exoplanet with a similar orbit as another exoplanet around the same star? The current IAU definition of a planet requires that "a planet has cleared its ...
8 votes
3 answers
1k views

Would an interstellar exoplanet telescope make sense?

Since the transit method of detecting exoplanets requires perfect alignment of orbits, would a Kepler-type telescope yield more exoplanet detections if sent out of our solar system even to relatively ...
0 votes
1 answer
115 views

The gases of technology [closed]

Ask around and find out what gases, vapors, and/or fumes, in the atmosphere are the result of advanced technology. Then use a spectroscopy to look for those compounds in the atmospheres of earth like ...