Gravity Falls Incorrect Quotes

The cheapest orbit available is LEO (Low Earth Orbit). People often think that "orbit" means there's no gravity. This is incorrect. In fact, the International Space Station (which is in LEO right now) is usually around 250 miles high and experiences about 90% of the gravity you experience on Earth. So why do the astronauts float around like there's no gravity? Although they are pulled toward the Earth all the time, they always "miss" it. Think of it like this: Imagine you fire a cannonball from the top of a tower. If you fire it softly, the ball will go a little ways then fall to the ground. If you fire it incredibly fast, it will just fly off into space. But between falling right down and going off into space, there are a lot of intermediate regimes. For a given height, there is some speed that is slow enough that it can't leave Earth, but fast enough that you'll never plop to the ground. If you were ridong that cannonball, you'd be falling, because gravity is tugging you down. At the same time, because you're going so fast, you'd be able to see Earth's curve. As you move from a point on the globe in a straight line, Earth curves down and away from you, increasing your distance from the surface. At this particular speed, you have two balanced effects: Gravity wants you down low, but your speed keeps you up high. So you just keep going around and around. You "orbit.

Similarly, we look for echoes from the tenth and eleventh dimension. Perhaps evidence for string theory is hidden all around us, but we have to listen for its echoes, rather than try to observe it directly. For example, one possible signal from hyperspace is the existence of dark matter. Until recently, it was widely believed that the universe is mainly made of atoms. Astronomers have been shocked to find that only 4.9 percent of the universe is made of atoms like hydrogen and helium. Actually, most of the universe is hidden from us, in the form of dark matter and dark energy. (We recall that dark matter and dark energy are two distinct things. Twenty-six point eight percent of the universe is made of dark matter, which is invisible matter that surrounds the galaxies and keep them from flying apart. And 68.3 percent of the universe is made of dark energy, which is even more mysterious, the energy of empty space that is driving the galaxies apart.) Perhaps evidence for the theory of everything lies hidden in this invisible universe. Search for Dark Matter Dark matter is strange, it is invisible, yet it holds the Milky Way galaxy together. But since it has weight and no charge, if you tried to hold dark matter in your hand it would sift through your fingers as if they weren’t there. It would fall right through the floor, through the core of the Earth, and then to the other side of the Earth, where gravity would eventually cause it to reverse course and fall back to your location. It would then oscillate between you and the other side of the planet, as if the Earth weren’t there. As strange as dark matter is, we know it must exist. If we analyze the spin of the Milky Way galaxy and use Newton’s laws, we find that there is not enough mass to counteract the centrifugal force. Given the amount of mass we see, the galaxies in the universe should be unstable and they should fly apart, but they have been stable for billions of years. So we have two choices: either Newton’s equations are incorrect when applied to galaxies, or else there is an unseen object that is keeping the galaxies intact. (We recall that the planet Neptune was found in the same way, by postulating a new planet that explained Uranus’s deviations from a perfect ellipse.) At present, one leading candidate for dark matter is called the weakly interacting massive particles (WIMPs). Among them, one likely possibility is the photino, the supersymmetric partner of the photon. The photino is stable, has mass, is invisible, and has no charge, which fits precisely the characteristics of dark matter. Physicists believe the Earth moves in an invisible wind of dark matter that is probably passing through your body right now. If a photino collides with a proton, it may cause the proton to shatter into a shower of subatomic particles that can then be detected.