Questions tagged [planet]

Questions regarding astronomical bodies orbiting stars which are of proper size to be called planets.

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16 votes
2 answers
12k views

Flying on dense atmosphere planets & moons

Would certain types of flying be possible on planets like Venus, Titan (which is a moon, I know :P), or gas-giants? I'm thinking on the aspects of these types of aircrafts: airships (that uses only ...
Zoltán Schmidt's user avatar
15 votes
2 answers
2k views

How do apsides of celestial bodies get their names?

If you look at this site, it shows some of our common bodies' apsidal names, as shown below: Objects Periapsis Apoapsis Galaxy Perigalacticon Apogalacticon Black hole Perimélasma ...
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7 votes
2 answers
2k views

Why would Hollywood's Planet X (at earth's L3) be unstable?

This NASA website states "NASA is unlikely to find any use for the L3 point since it remains hidden behind the Sun at all times. The idea of a hidden "Planet-X" at the L3 point has been a popular ...
uhoh's user avatar
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0 votes
1 answer
159 views

Intercommmunication between crewed space missions in all planets of solar system [closed]

As we know Human Communication taking place between Man in space, Man on Moon, Man on Mars (Future exploration) with Human beings on Earth planet where we are living with the help of control stations ...
Prashant Akerkar's user avatar
29 votes
4 answers
5k views

Could one of the interstellar probes discover Planet IX by accident?

Could one or some of the spacecraft sent beyond the Kuiper belt discover (or even disprove) the hypothetical Planet IX? That doesn't necessarily mean coming so close you'd recognize the planet in ...
Giovanni's user avatar
  • 505
8 votes
2 answers
2k views

Adapting to Increased Gravity on Alien Planets

What would mankind use in order to adapt or merely cope with the effects of a large increase of gravity on an alien world? Assuming there are no other problems we would face.
The Glis Jackel's user avatar
6 votes
5 answers
10k views

How to simulate Earth's gravity in future colonies on other planets?

What would be a viable means to simulate and maintain Earth's gravitational acceleration in a future colony built on another planet? I am mainly focusing on terrestrial planets, where a colony could ...
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5 votes
3 answers
348 views

Has any other term been used for a solar day on a solar system body besides "sol" on Mars?

My interest was piqued by this question and answer. For several reasons NASA needed to refer frequently and extensively to a Martian solar day, and "sol" became the nom du jour. There have been ...
uhoh's user avatar
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18 votes
5 answers
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Is Mohs scale of mineral hardness applicable for rocks and minerals of terrestrial planets other than Earth?

The Mohs scale of mineral hardness is a qualitative ordinal scale characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material. Now there is ...
Nilay Ghosh's user avatar
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16 votes
3 answers
3k views

Could twin planets exist and share the same orbit?

Could there be a stable orbit shared by two planets with the same mass and density? Regardless of whether the formation of such system is possible or not. For example, if Earth and Venus could have ...
rraallvv's user avatar
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14 votes
1 answer
7k views

Changing the rotational rate of a natural body

Let's say that for the purpose of terraforming, we need to speed up the rotation of a planet (like Venus), a moon or an asteroid to near Earthian day. How would we go about doing this? Can this be ...
coleopterist's user avatar
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13 votes
4 answers
299 views

What properties are used to quantify the odds of a star harboring earth-like life?

Say you start with a list of stars. What properties do we believe to be critical in the present existence or future formation of earth-like life in those star systems? How can one reasonably pare down ...
Stephen Collings's user avatar
12 votes
4 answers
4k views

What is the exact format of the JPL ephemeris files?

I'm attempting to do some basic planet position calculations using the JPL ephemeris data. The first step is to properly parse the files. Here's my understanding so far: The header file gives a ...
Lukas Bystricky's user avatar
11 votes
1 answer
422 views

Are any spacecraft heading remotely where Planet 9 is expected to be?

Planet 9, the hypothetical planet predicted Batygin and Brown, is expected to have an apoasis near the galactic center. Is there a spacecraft that is heading in that direction? Specifically, they ...
PearsonArtPhoto's user avatar
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8 votes
2 answers
491 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 ...
Maelish's user avatar
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6 votes
2 answers
990 views

Can a "free launch" from a space elevator really be free?

The question Benefit of sling shot effect with a space elevator implies that you can get free $\Delta V$ from a space elevator launch. As highlighted in this answer on SciFi quoting Sheffield book "...
James Jenkins's user avatar
5 votes
1 answer
1k views

What happens if we bury a human on other planets or moons [closed]

Given that there are no organisms on other planets/moons, if we bury a dead human (or other organisms), will it decay? I think the body will be intact as on earth there are several organisms/micro ...
omer asif's user avatar
2 votes
2 answers
190 views

best way to generate electricity on any planet's dark side

What options are available for generating electricity in a space colony if it is at the planet's darkest point all year around without help from nearby outposts?
Osm's user avatar
  • 121
2 votes
1 answer
86 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 ...
Outsider's user avatar
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