OMG she is going for the hard ones. I LOVE IT. For the fire question, fire is plasma, one of the states of matter, which is very hot and magnetic gas. All stars are made of plasma. When you get enough gas together, the pressure of it causes a lot of heat, and it becomes plasma.
https://twitter.com/DrRonnesia/status/1406275264766791680
Otherwise than that, fire doesn't really form in space. On a space station however, you can make a fire in normal ways, but the fire looks like a bubble. Since there isn't gravity acting upon it like we have on the Earth surface, the fire is attracted to itself and forms a sphere 
This goes into the second question of how planets are formed. When you have a bunch of material like rocks and dust near each other, each of their gravities affect the things around it. A planet usually starts with a larger rocky object surrounded by smaller rocky objects and...
...dust. Due to its larger size, it pulls all those smaller objects to it and it builds up until you get a planet. Planet formations usually happen in "protoplanetary disks" which is when a star collects all of the surrounding material into its gravitational plane.
This is related to that second part of the fire answer because planets form in a sphere for the same reason that fire does. The gravity wants to compact everything as much as possible, and the shape that best does that is a sphere.
For the last question, there are several things that can happen. Here is a few of them:
If we’re talking about when stars collide, it depends on the types of stars and their speed. When two stars have a high-speed collision, it results in a huge explosion called a supernova.
If we’re talking about when stars collide, it depends on the types of stars and their speed. When two stars have a high-speed collision, it results in a huge explosion called a supernova.
In the middle of the supernova, you can have either a neutron star or a black hole. A neutron star is the collapsed core of a supermassive star. A black hole is a thing in space that has such strong gravity, almost nothing can escape it, not even light.
If it’s a slow-speed collision, it can result in something called a Blue Straggler Star, which is when the two stars merge together and form a huge and very hot star. Neutron star collisions can result in a larger neutron star or even a black hole. A really cool possibility...
...for a collision is between a Red Giant star and a White Dwarf star, which can result in the White Dwarf being swallowed by the Red Giant, but they don’t technically merge together into a totally new star.
If we’re talking about when stars get really close to each other when they’re orbiting around each other, the stars actually share material. Due to the gravity of the stars and their closeness, the stars pull on the other star so hard that it takes material from the other star.
Thus, making it look like a weird peanut shape. These can either be completely stable and the stars will stay like that forever, or maybe in time they will collide and explode into a supernova, or even one star gets so much material from the other star that it explodes.
If we’re talking about two stars passing each other and barely missing a collision, the stars go into orbit around each other and results in the same as the previous situation.
So basically, in all the different ways, you either end up with a new unique star or a black hole.
So basically, in all the different ways, you either end up with a new unique star or a black hole.
Picture Credits:
Fire: NASA
Protoplanetary: NASA JPL
Binary Star System: NOVA PBS
Fire: NASA
Protoplanetary: NASA JPL
Binary Star System: NOVA PBS
• • •
Missing some Tweet in this thread? You can try to
force a refresh
