Cosmology and astronomy
- Birth of stars
- Accreting mass due to gravity simulation
- Challenge: Modeling Accretion Disks
- Becoming a red giant
- White and black dwarfs
- Star field and nebula images
- Lifecycle of massive stars
- Supernova (supernovae)
- Supernova clarification
- Black holes
- Supermassive black holes
The simulation Sal mentions in the video can be found directly following this video in the lesson.. Created by Sal Khan.
Want to join the conversation?
- What is Critical Mass ?(27 votes)
- The mass after which an object can start performing fusion i.e. the point at which the gravitational force of an object allows hydrogen to fuse into helium.(5 votes)
- in the movie interstellar people go through a black hole, would it be scientifically possible for them to survive ?(5 votes)
- Maybe. If you were to fall into a normal black hole, the tidal forces would stretch you out and tear you to pieces. The black hole in Interstellar is a super-massive black hole that is spinning at about the speed of light. There's a debate in the physics community about what exactly this means, but it's possible that you could fall in without being shredded.
If you're interested, you should look up the work of Kip Thorne. He's an astrophysicist who did a lot of the science for Interstellar.(16 votes)
- Why is it that the moon can change from a pale lemon - to a bright gold - to a red moon?(5 votes)
- Same reason sunsets are colorful and the sky is blue. The atmosphere scatters the light.
At the horizon, light from astronomical objects is passing through at a very slight angle to the surface of the Earth, which means it has more atmosphere to pass through. This causes even more scattering to occur, leaving primarily the longer, redder wavelengths to make it through.(15 votes)
- Does gravity have something to do with the structure of the galaxy?(5 votes)
- I'm pretty sure that without gravity, the galaxy and maybe even the universe would be absolute chaos. I'm not even sure what to expect if we didn't have gravity. Would the moon collide with earth, or would it just float away? Terribly exciting question though!(5 votes)
- What happens when 2 sun's collide?(5 votes)
- usually it wont happen but FYI if it happens an intense grav feild will form which in most of the cases will make a supernova but in some special cases it might form a black hole and no the possibility of forming a larger star is only possible when 2 stars having a really HUGE difference in mass and density collide with each other(4 votes)
- Sorry, I'm new to the whole star thing, what did the red stick represent?(2 votes)
- you can think of it as the axis of rotation
Strictly speaking it is the angular momentum vector of the cloud(3 votes)
- What computer language did Peter Collingridge use to write this simulation? I'd like to work with it offline as well.(2 votes)
You can see Peter's code here, and you can also modify it to make your own "spinoff"
- what is big bang nucleosynthesis? how it is connected to the formation of elements?(2 votes)
- Nucleosynthesis is the formation of atoms. Big bang nucleosynthesis is simply nucleosynthesis during the big bang.(2 votes)
- What defines a "binary system"?(2 votes)
- I can't seem to find the link to the simulation.(2 votes)
- If you go to the Modeling Accretion Disks Challenge, and click on spin-offs, you will find the simulation by Peter.(2 votes)