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Questions tagged [exoplanet]

Questions regarding planets outside of Earth's solar system.

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1answer
199 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 ...
18
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2answers
2k 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 ...
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1answer
48 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
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2answers
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"?
4
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4answers
311 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 ...
7
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1answer
294 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 ...
8
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1answer
289 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
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2answers
163 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
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3answers
330 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 ...
1
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1answer
156 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 ...
5
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2answers
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 ...
7
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2answers
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-...
4
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0answers
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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 ...
1
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1answer
163 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
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1answer
430 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 ...
3
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1answer
137 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
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3answers
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
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1answer
91 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 ...
4
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2answers
390 views

Could a rogue planet's moons harbor life?

Because stars kill stuff with radiation, flares, etc, then die taking planets with them, might it not be easier for living things to live on a rogue planet's moon? Say you had a rogue Jupiter-like ...
2
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1answer
176 views

For one way missions to any planet is it planned to pay astronauts? [closed]

As one way missions astronauts would never come back (because it's a real one way mission with a many years trip), is it planed to pay them or giving them enough hardware, tools, food is their salary ?...
0
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1answer
94 views

What exoplanet atmospheres might support life beside our nitrogen and oxygen atmosphere? [closed]

What exoplanet atmospheres might support life beside our nitrogen and oxygen atmosphere? Related question: Could an exoplanet atmosphere be very similar to our own, but contain some component toxic ...
4
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1answer
139 views

What is the potential limit extraterrestrial life can survive and under what factors?

A lot of material about extraterrestrial life seems to suggest that life essentially cannot survive in environments with more radiation beyond what's on Earth. For example, when red dwarfs planets are ...
25
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1answer
470 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 ...
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3answers
925 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?
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2answers
4k views

How do we determine and estimate the age of exoplanets like Kepler-452b?

Scientists recently discovered an exoplanet named Kepler-452b which they state is "is 6 billion years old". How did they determine this age? How could we possibly predict the age of any exoplanet? ...
2
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2answers
422 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
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6answers
1k views

Technology for unmanned spacecraft to exoplanets

I am interested in the possibility of sending unmanned reconnaisance spacecraft to study exoplanets, especially Earth-like ones with the ultimate goal of detecting alien life. Certainly earth-based ...
8
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1answer
321 views

Is there a system for choosing the Prime Meridian on a given body/world?

According to the answer to this question, the 0° longitude of the Moon is that which points toward Earth. On Earth it goes through Greenwich (although I was amused to hear that the French disagreed), ...
0
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1answer
183 views

Have we found another earthlike planet?

Space Colonization has become a popular trend in Sci-Fi movies. It would be a thrilling experience if we could travel from planet to planet. Have we found another earth-like planet close enough for ...
13
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5answers
2k views

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

Astronomical spectroscopy can be used to determine the chemical composition of far away bodies. In the related question Can we detect atmosphere on exoplanets? we learned that even now we are studying ...
15
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2answers
3k 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 ...
11
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1answer
1k views

How big is Earth's sphere of broadcast influence?

The question Interstellar eavesdropping points out that we have been broadcasting to space for a long time, currently we are approaching a century. This means every star system in within 100 light ...
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1answer
540 views

What are the benefits of tides? Should we look for them on exoplanets? [closed]

If there had been no lunar tides on Earth, would life have been less likely or evolved less? If tides benefited life, how so? The anthropic principle resolves the rarity of Earth's features that are ...
7
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1answer
413 views

Can we detect atmosphere on exoplanets?

We are finding new planets in other solar systems all the time. Some of them are in a habitable zone of their sun. Are we able to detect the atmosphere of any exoplanet? Is there any atmospheric ...
8
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2answers
455 views

NASA just announced 715 new exoplanets were discovered, what do we know about them?

I have been trying to find information on how far away these new exoplanets are from Sol. Does anybody have a map or a table that shows their distance to us in light years. There only seem to be 100 ...
6
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4answers
252 views

Are there any other Earth-like planets in the universe?

There are many galaxies in the universe. Is there any other Earth-like planet out there?
6
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1answer
190 views

Is it possible to observe satellites orbiting exoplanets?

Is it possible to observe a satellite orbiting a distant exoplanet? If its possible, it would seem to indicate that we have found intelligent life on that planet, since you need advanced technology to ...
33
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3answers
18k 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 ...