43 votes

Can an asteroid go through the sun?

No. I'm not knowledgeable enough to derive what would happen in this scenario, but I bet you Randall Munroe is. More specifically, he knows what happens to a baseball that travels at .9 c from the ...
Qami's user avatar
  • 7,001
32 votes

Can an asteroid go through the sun?

For certain values of "through" I'll give a definite yes. To be clear, the Sun is much too dense to permit a near-central passage of anything less dense than white dwarf matter at merely ...
Zeiss Ikon's user avatar
  • 45.9k
27 votes
Accepted

How can a magic civilization stop their sun from dying?

If we're talking magic here, you can note something about the evolution of stars. When they expand into red giants and explode in a supernova, they don't actually use up their hydrogen. The issue is ...
Sam Kitsune's user avatar
  • 1,984
18 votes

Is it possible to have a habitable planet with 2 sun that have sunset for one and sunrise for the other at the same time?

an habitable planet with 2 suns that is in just the right orbit so that each day one sun sets at the same time the other rises For this to happen, the suns and the planet need to be on the same line, ...
L.Dutch's user avatar
  • 287k
16 votes

Can an asteroid go through the sun?

TL;DR: No, because an object moving at high speeds will break apart even quicker. I suspect it wouldn't. I don't know if there's been any work done on relativistic impacts onto the Sun, but a group ...
HDE 226868's user avatar
  • 101k
15 votes

How could physics possibly explain the sun hanging motionless in the sky?

Giant mirrors in space. (Assuming you want a reasonably non-apocalyptic way of making "the Sun stand still", and a technological level within the current millennium) A large (sort of) ...
LSerni's user avatar
  • 55.2k
14 votes

How could physics possibly explain the sun hanging motionless in the sky?

On Earth, the planet would need to suddenly stop spinning. At the equator, that's roughly 1000 mi/hr "just" to a dead stop. Woe betide the billions of people close enough to water to be ...
user535733's user avatar
  • 28.9k
12 votes

What will exactly happen if a small amount of iron from the sun's core were teleported to the Earth's surface?

Iron becomes a gas at 5182F, about half the temperature of the Sun. There is probably plenty of iron in the sun, from asteroids and comets falling in. Certainly enough to make a sword. But any iron in ...
Amadeus's user avatar
  • 34.7k
12 votes

How can a magic civilization stop their sun from dying?

Rob Peter Often, the only way to extend the life of something that is dying is to steal life from something else. In many stories, an aging sorcerer tries to capture a young person and then sacrifice ...
Tom's user avatar
  • 14.5k
11 votes

What will exactly happen if a small amount of iron from the sun's core were teleported to the Earth's surface?

Move your teleporter a bit, to target Mercury's core instead of the sun Consider teleporting iron from Mercury's core. It has huge amounts of pure iron, and it is solid. Be careful ! Mercury's core ...
Goodies's user avatar
  • 14.9k
11 votes
Accepted

What would something as hot as the sun do to its surroundings on Earth?

Scale of the disaster: anectodical Sad. I love a good planet-shattering assumption as much as the next guy, but this won't do. I blame your lack of ambition. Yes, the surface of the sun is hot, but it'...
Barbaud Julien's user avatar
10 votes

How can a magic civilization stop their sun from dying?

Give it back. You will no doubt get some snarky comments about "magic is magic. whatever you want." Not helpful. Maybe these comments of mine will vaccinate your question against such. ...
Willk's user avatar
  • 305k
9 votes

Can an asteroid go through the sun?

No, but it can come "out of the sun". Ask a military pilot. The asteroid would have to be falling almost "straight down" from interstellar space or the Sun's Oort cloud, in an ...
nigel222's user avatar
  • 11.7k
9 votes

How can a magic civilization stop their sun from dying?

Push it Closer (or Further) The sun is dying. There is no getting around that. Its energy has been stolen and the Red Giant phase begins early: The Sun cools and expands to gobble up the first four ...
Daron's user avatar
  • 66.1k
7 votes

How can a magic civilization stop their sun from dying?

First, if your setup is Earth-like, your magic is impressively inefficient. You can use as little as few hours of solar energy output and completely blow the Earth into dust. Or few days worth of ...
fraxinus's user avatar
  • 6,547
6 votes

Can an asteroid go through the sun?

Newton came up with a fairly simple way to estimate how far a projectile can travel through a medium. Newtons approximation for impact depth The formula is Depth=Projectile length*projectile density/...
Taemyr's user avatar
  • 1,762
6 votes

Hosting Life Near an Anti-Star

How does this work? If the core of the star were made of 50/50 matter and antimatter, it would supernova immediately, so we know that's not what's happening. You must have a star that is mostly one ...
Luke's user avatar
  • 3,423
6 votes

What will exactly happen if a small amount of iron from the sun's core were teleported to the Earth's surface?

Summary My concern here would be the pressure difference. The Sun's core has a pressure of about 265 gigabar. That's about 265 billion times higher than sea level on Earth. Simultaneously, the ...
MichaelS's user avatar
  • 6,343
6 votes

Is it possible to have a habitable planet with 2 sun that have sunset for one and sunrise for the other at the same time?

L1 Lagrange point is not stable, and neither is the barycenter What you're asking about is the L1 Lagrange point, which is not a stable location. https://ke.gsusigmanu.org/3669-could-there-be-a-planet-...
Robert Rapplean's user avatar
6 votes
Accepted

how would you call a star when referring to a "sunset" or "sunrise"

Why wouldn't they still just call it sunrise/sunset? they would probably refer to the star at the centre of their solar system as a sun. It's a fairly common trope in sci-fi settings that Earth and ...
mgh42's user avatar
  • 1,361
6 votes

how would you call a star when referring to a "sunset" or "sunrise"

The names of the planet and the star are taken from Chinese language. Then why are you looking for sunrise and sunset in English? Take sunrise (Rì chū) and sunset (Rìluò) from Chinese also.
imtaar's user avatar
  • 5,661
6 votes
Accepted

The Smallest Sun

8.7% the diameter of our sun According to fancy-pants astronomer Todd Henry: a star can be no smaller than 8.7 percent the diameter of our Sun to sustain nuclear fusion. It must also have an average ...
Tom's user avatar
  • 14.5k
6 votes

How much water must I dump on the Sun to put it out forever?

To collapse directly into a black hole and thereby "put out" the fusion reaction that powers the sun, you need about 20 times the mass of the Sun, or about 19 more Sun-Masses worth of water. ...
Amadeus's user avatar
  • 34.7k
5 votes

Hosting Life Near an Anti-Star

Matter-Antimatter annihilation produces gamma rays if it happens at low energies or exotic particles if it happens at high energies. For the electron-positron annihilation: When a low-energy electron ...
L.Dutch's user avatar
  • 287k
5 votes

Is it possible to have a habitable planet with 2 sun that have sunset for one and sunrise for the other at the same time?

After considering many different configurations of star systems, I have decided that the most stable system where the two visible stars would always be 180 degrees apart as seen from the planet would ...
M. A. Golding's user avatar
5 votes

Is it possible to have a habitable planet with 2 sun that have sunset for one and sunrise for the other at the same time?

Frame challenge: a synchronised sunset/sundown would be really underwhelming. The reason why sunsets and sunrises are romantic and dramatic is because they a) cause the sky to change (relatively) ...
Ottie's user avatar
  • 5,758
5 votes

How can a magic civilization stop their sun from dying?

Arrange a deity to tell the sun it can't do this Supernovas are actually childish behavior. Instead of shining properly, the sun would first hide and then pop up suddenly, larger, to give everyone the ...
Goodies's user avatar
  • 14.9k
5 votes

How can a magic civilization stop their sun from dying?

I like all the other answers but I think everyone is underestimating the amount of power involved here. The Sun outputs 3.8 $\times$ 1026 watts. For comparison, that is like the energy output of the ...
The Square-Cube Law's user avatar
4 votes
Accepted

Endless global night.. but an agreeable climate, how come?

Brown dwarf sun. https://en.wikipedia.org/wiki/Brown_dwarf Brown dwarf emissions are almost all infrared. They do not put out much visible light and what they do is red. Here are compared the ...
Willk's user avatar
  • 305k
4 votes
Accepted

What will exactly happen if a small amount of iron from the sun's core were teleported to the Earth's surface?

Other answers have already covered why the iron would be dangerous to harvest because of its gaseous state... but the other important thing to consider is that even if you could teleport pure iron in ...
Nosajimiki's user avatar
  • 92.5k

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