All Questions
81
questions
-5
votes
2
answers
167
views
Is Proxima Centauri a Planet?
Proxima Centauri meets all the requirements for Planet status, although it is a star, can an object be a star and a planet at the same time? normally, the answer should be no, but this is the problem ...
- 11
4
votes
1
answer
80
views
How does carbon end up in the remnants
We know that one way carbon ends up in the interstellar medium which by the way is one or the heavy elements that help form the planet.
But we also know that in the core, carbons fuse with another ...
- 315
4
votes
2
answers
1k
views
How small stars help with planet formation
As I understood, low mass stars in their core go through fusion, but only the fusion of hydrogen happens. When it depletes hydrogen, fusion stops as temperature is still not high enough to support ...
- 315
6
votes
1
answer
162
views
Stars being eclipsed by planets
I would like to figure out if any of the solar system planets have ever eclipsed a particular star (i.e. crossed the line of sight from Earth to the star) or will eclipse it in the future. Is that ...
- 228
5
votes
1
answer
205
views
Does the orbital velocity of a planet affect its escape velocity from the planet surfaces?
I'm trying to write a hard sci-fi novel with good accuracy, but when it comes to astronomy, I'm a total amateur.
Here's my fictional planet that orbit a black hole information:
Star Mass = 10000 Solar ...
6
votes
1
answer
67
views
Does a more massive main proto-body result in more massive satellites? More satellites?
Suppose that we have a forming protostar and an accompanying protoplanetary disk.
Does the mass of the protostar have any direct relation to the masses of resulting planets or amount of resulting ...
- 1,872
5
votes
1
answer
151
views
What kinds of stars have viable habitable zones other than G-type stars, and what would life be like orbiting them? [closed]
What would foliage, landscape, and quality of life on dwarf stars and blue stars? Would it be possible for a human to live without high-tech devices and such?
- 51
0
votes
1
answer
272
views
What would the temperature be on the surface of Sirius B [closed]
If Sirius B was a planet like Earth and not a white dwarf star what would the temperature be on the surface of Sirius B at its nearest and furthest distance? 8.2 AU to 31.5 AU
EDIT: I want to know if ...
- 121
7
votes
2
answers
321
views
Could stars like S2 near the galaxy's center have planets in a stable orbit?
I read about one of the stars orbiting Sagittarius A* and according to Wikipedia, it reaches a maximum speed of 0.03c during its orbit. Would this (or any other factor) make it impossible for a planet ...
- 418
1
vote
2
answers
300
views
Star and Planet temperature relationship
Let's assume there is this planet with no atmosphere, no geothermal activity and an average temperature $\ T_p$.
Now, if the distance between the planet and the star is $\ d$ and the radius of the ...
1
vote
1
answer
123
views
Effects of a supernova shockwave or gravitational wave to a nearby planet's orbit?
I've been reading about recent reports regarding COCONUTS-2B, a planet with the longest orbital period known - 1.1 million years. As a previous question asked, What precisely leads to planets like ...
- 6,684
3
votes
0
answers
53
views
How to distinguish primary hosts (stars) and orbiting satellites (planets) and tertiary bodies (moons) by their mass and trajectory?
Suppose one has run a gravitational simulation of N bodies (has the mass, vector positions, vector velocities, etc for each body), but knows nothing a priori about ...
- 31
3
votes
0
answers
45
views
What is the theoretical maximum variability a pulsating red giant can have such that a habitable planet can stay habitable for long periods of time?
I was reading about red giants and came across this statement:
Some research suggests that, during the evolution of a 1 M☉ star along the red-giant branch, it could harbor a habitable zone for ...
- 6,684
3
votes
1
answer
297
views
Why don't we detect planets around OB stars and no terrestrial planets around A or early F stars?
Looking at an exoplanet database, I noticed that there are very few planets detected around main-sequence OBA stars, and most of them are gas giants/brown dwarfs. Why can't we detect low-mass planets ...
- 6,684
2
votes
0
answers
60
views
Regarding core fragmentation of a gas giant in the envelope of a red giant
We know that large gas giants, such as Jupiter, have degenerate cores. Let's say there is a hot Jupiter ($5M_J$) that orbits an F-type star. When the star expands into a red giant, the hot Jupiter's ...
