Search found 151 matches

by 19683
Thu Mar 17, 2016 1:11 pm
Forum: Velocity Raptor
Topic: Backward Time???
Replies: 3
Views: 18403

Backward Time???

On bonus level 40, if you go to the top right corner of the screen and accelerate to the right, the bullets going from left to right go backwards back into the cannon! Since the raptor is accelerating, it is not an inertial frame, but this still seems impossible. I know that relativity can slow down...
by 19683
Tue Mar 15, 2016 12:45 pm
Forum: Velocity Raptor
Topic: Just a few Relativity Questions
Replies: 28
Views: 36708

Re: Just a few Relativity Questions

So is the center of the Earth an inertial frame since it is in 'free-fall' around the sun?
by 19683
Mon Mar 14, 2016 10:58 pm
Forum: Gravity Simulator
Topic: Opposing orbits
Replies: 2
Views: 6560

Re: Opposing orbits

Yeah, that makes sense. So planets going in opposite directions pass each other for less time and their interactions cancel out or don't add up over time. Thanks.
by 19683
Sun Mar 13, 2016 2:24 pm
Forum: Velocity Raptor
Topic: Bug
Replies: 6
Views: 15336

Re: Bug

Oh, I see! Light from far away bullets traveling toward you hasn't arrived yet, so we see them back in time. But back in time they were even farther away, so they seem stretched ('red-shifted'). The opposite happens for bullets moving moving away from you. Back in time they were closer to you, so th...
by 19683
Sun Mar 13, 2016 2:19 pm
Forum: Velocity Raptor
Topic: Bug
Replies: 6
Views: 15336

Re: Bug

Is it because of acceleration?
by 19683
Sun Mar 13, 2016 1:03 pm
Forum: Gravity Simulator
Topic: Opposing orbits
Replies: 2
Views: 6560

Opposing orbits

I noticed that when two massive planets orbit nearby in the same direction, they interact a lot and tend to be unstable, switching place, swinging out of the system, or even colliding. However, when the two planets are going in opposite directions, they seem to be very stable and don't interact much...
by 19683
Thu Mar 10, 2016 5:06 pm
Forum: Gravity Simulator
Topic: How to produce other inverse laws in parallel universes
Replies: 1
Views: 12029

Re: How to produce other inverse laws in parallel universes

Hmm. Fractals can have irrational numbers of dimensions, so if fractal space is possible, then all laws like r^(-x) would work.
General relativity only really works in 3 spatial dimensions though.
by 19683
Thu Mar 10, 2016 5:03 pm
Forum: Gravity Simulator
Topic: r^(-2.9)
Replies: 2
Views: 6765

Re: r^(-2.9)

Yeah, I think I see what you mean. So the orbit itself precesses faster than the planet is moving and that makes it go around several times before getting farther again. I wonder what force laws can produce this effect, like if r^(-2.8) or r^(-2.5) will work.
by 19683
Wed Mar 09, 2016 6:32 pm
Forum: Gravity Simulator
Topic: r^(-2.9)
Replies: 2
Views: 6765

r^(-2.9)

I was playing with various gravity laws and found that r^(-2.9) was very strange. The orbit spirals inward, and it seems like it will collapse, but then it swings around the star several times and the comes back out. Why does it behave like this?
by 19683
Sat Oct 05, 2013 7:26 pm
Forum: Gravity Simulator
Topic: Calling all Suggestions
Replies: 124
Views: 52277

Re: Calling all Suggestions

robly18 wrote:Ah.
I should really watch that movie. Shame I'm not much of a TV or movies or anything-that-isn't-computer guy :\
Good TV shows:

The Universe
Mythbusters