A lot of people think that to get to orbit, you just have to go up, but actually you need to go sideways.
Imagine throwing a ball that leaves a visual trail behind it. You throw it straight up, it comes straight back down and just leaves a vertical line. Throw it across the room, and it makes an arc. Take it outside, throw it really hard, and it makes a bigger arc. Zoom the camera out, and throw it so hard it goes over the horizon. It leaves a pretty long arc right? If you throw it hard enough, that arc goes farther and farther past the horizon until it misses the ground entirely and comes right back around to you. That’s an orbit!
But that’s only part of it. You see, any time you impart force on an object in orbit, you only change its trajectory, not its current position. Since your arm is now the lowest part in the ball’s orbit, you can never raise that point above where your arm is. But you can affect the other side of its orbit–the faster you throw the ball, the higher the opposite side of the orbit gets. Let’s head up to the highest point in the ball’s orbit, and give it another push. Again, that doesn’t affect its current position, but it does affect its trajectory. Making the ball go faster forward increases height at the opposite side of its orbit, so if we push it with the right amount of force, we can make its orbit circular!
Now you know enough to get a rocket to space! Well, kind of. You also need to know about fuel and the tyranny of the rocket equation, but that can wait until you play Kerbal Space Program or get a job at NASA
Hey! Your user name matches the things you said!
Let’s imagine we’re in a rocket ship in a circular orbit, and we want to go back to earth. You might think you need to point towards the ground and turn your engine on, but remember how we got up here–we’re in orbit because we’re going sideways very fast. The most efficient way to come down is to point backward along our orbit and slow ourselves down, to lower the height at the opposite side.
What happens if we do point straight downward? Well, we would start going downward, but because we aren’t pointing straight backward, we aren’t actually reducing our speed, only changing the direction of the orbit. It would take much more energy to come back to earth this way, and because we aren’t actually reducing our speed, it would be much more dangerous, because we would be entering the atmosphere faster than if we had pointed backwards instead.
In a worst case scenario, we would run out of fuel before re-entering the atmosphere. This is very bad, because as we fall towards the earth, we start moving faster. Remember how moving faster at the lowest point in an orbit increases the height of the highest point? If we don’t hit the atmosphere, the top of our orbit will end up even higher than it was before!
worst case, you miss the earth and go lost on a massive elliptical orbit for some time.
To return 500 years later.
yeh thats like the first thing you intuitively learn when playing KSP.
The Guide says there is an art to flying", said Ford, “or rather a knack. The knack lies in learning how to throw yourself at the ground and miss.”
- Douglas Adams
I’ve watched a lot of Star Trek so I know a lot about gay space socialism
Well don’t ask jon snow
I used to know, but now I’m not so sure anymore.
i can whistle continuously without the need for breathing stops
I thought you died, Roger Whittaker.
Wtf how
It just kind of happened because i got annoyed that i had to stop during long phrases to breathe in so i just kind of taught myself how to whistle while breathing in. I just googled it to see how special that is but all im seeing is health conditions.
A fellow whistler! I prefer whistling Bach.
deleted by creator
Not yet, but I’ll keep you updated.
the sun is the biggest star in our observable solar system
If you’re ever looking for cheap jewelry/earrings, you should be very very careful.
CTV Marketplace did an investigation a few years ago, and they found that a lot of children’s jewelry contained high levels of lead and/or cadmium. These pieces were found in multiple places, including Claires and H&M. Some children’s makeup was also contaminated.
I think I’ve… no, I’ve never done any of that before, sorry.
Just fine dining and breathing, I’m afraid
“My name?”
I got experience with yo Mama’s ass
I like beans
This could be the requirements for a job
- 5 years of experience with something (E)
- 2 years of experience with anything (D)
‘Something’ is what we abstractly call that which is both not nothing and has some significance to us beyond being merely anything.
According to Descartes I think therefore I am (and that’s all I know), but to be honest I’m not convinced…
I also know that he was a drunken fart.
Hello, Bruce. Have you seen Bruce?
