It only means that if the Universe does repeat, if it is a closed hypersurface, and if we could theoretically re-emerge in the same spot after traveling in a straight line for long enough, it is so on a scale that's larger than the part we can observe. Near the moon, down is towards the moon. Now we have the answer! And sideways speed is what you need to get into orbit around Earth, without crashing back down. Since we define up and down relative to the local gravity field (in this case, Earth's), going up would put you into a higher orbit, or perhaps break orbit entirely. A visualization of a 3-torus model of space, where our observable Universe could be just a small... [+] portion of the overall structure. Nothing magical happens if you are leave earth's surface and board the International Space Station: down is still in the same direction. Otherwise you’d pop up and then fall back into your super hole, heading straight back the way you just came from. It seems to take so much fuel to go straight up, and in my mind I can't see to get my head around why they don't take off like a plane and go up gradually like that. For another, there are hundreds of billions of galaxies, all appearing younger in the distant past the farther away we look. As you go deeper into the black hole, space becomes ever more curvy The outermost boundary of the hole is its event horizon, the point at which … There is no "up" and "down" in space. My two books, Treknology: The Science of Star Trek from Tricorders to Warp Drive, Beyond the Galaxy: How humanity looked beyond our Milky Way and discovered the entire Universe, are available for purchase at Amazon. (3) The water pressure is very high. 73% Upvoted. Image credit: ESO and deviantART user InTheStarlightGarden, under a c.c.-by-s.a. 4.0 license. And since the universe is flat, is there anything below it? After all, although we're limited by what we're capable of observing, the possibility of a Universe that's vastly different from what we've concluded thus far might lie just beyond the cosmic horizon. The Nile river would never flow north if north were really up. America's Top Givers: The 25 Most Philanthropic Billionaires, EY & Citi On The Importance Of Resilience And Innovation, Impact 50: Investors Seeking Profit — And Pushing For Change, Indirect Contributions Are Essential To Physics, The Crisis In Theoretical Particle Physics Is Not A Moral Imperative, Why Study Science? All we can see is the part of it accessible to us, which allows us to place constraints on what its topology is allowed to be. location. Up and down don't really mean anything if you're in microgravity. If you could throw a ball from above our atmosphere, gravity still pulls it down in the same way as on Earth. This isn’t a mistake… you will see the exact same thing in every other picture and video of a rocket launch. Down is therefore towards the earth's center and up is away from the earth's center when close to the earth. Well, you'd still die, but at least you wouldn't explode! If you get far enough away from our cluster of galaxies, down just becomes towards the next closest cluster. Suppose you are hanging upside down. If you keep going, you will leave the Milky Way galaxy. An infinitely repeating Universe would mean that someone could travel in a straight line and return... [+] to where they began. Ask Ethan: How Large Is The Entire, Unobservable Universe? When things drop or spill things it all goes down. Perhaps, as time goes on and more of the Universe slowly reveals itself to us, or as our curvature measurements get more precise, we'll discover a departure from what we've concluded so far. Surprisingly, you probably wouldn’t explode. You should be able to convince yourself that the only way this can happen is if the two objects start off in the same direction and at the same speed. The appearance of different angular sized of fluctuations in the CMB results in different spatial... [+] curvature scenarios. Gravity is a centrally attractive force, so "going down" means falling or being pulled towards the center of the nearest massive object. No matter how technologically advanced you imagine a human will someday be, so long as we're limited by the speed of light we'll never be able to find out, even if the Universe is really this way. A simulation of the structure of the Universe. Whenever they use such terms, they really just mean "things in space falling down". Does space have an up and down Ok so we fly to the moon in our space ship i get that. Given that we're limited to how far light can travel in 13.8 billion years, there's plenty of room for this to still be the case. Is it possible that one (or more) of them is an infant version of the Milky Way we grew up in? Image credit: ESA and the Planck collaboration. Image credit: ESA and the Planck collaboration. In general, the meteors travel in a (approximately) straight path. There is an up and down in space. But if I was looking at this happen from me floating in space what direction would they be going. What Is (And Isn't) Scientific About The Multiverse, The Pillars Of Creation Haven't Been Destroyed, Say New NASA Images. report. Opinions expressed by Forbes Contributors are their own. The Chinese space station Tiangong 1 , for example, about 2 years to fall out of orbit. in one direction with identical galaxies in another would be evidence for a repeating Universe. When falling freely, our human senses cannot detect which way is down. If you went straight up, you wouldn't have any sideways speed. The down direction is still very real and is evident from the fact that you are falling in that direction, even if you can't feel which way is down. If the Universe were finite and closed on itself -- if parts of it repeated in other places -- it would have shown up in the cosmic microwave background. What happens to a can of Coca Cola when you send it up to space? If there is what would you see? Second, without rockets to maintain your speed, you'll slow down and spiral toward Earth. Furthermore, let's consider what happens if two objects start off along the same path in space-time. The chances that it will actually hit you are pretty small, but it might hit someone else nearby. If you like this video - put Thumb Up button (please) and Subscribe to my channel! Down is not towards the earth's South Pole and up is not towards the earth's North Pole. If the density is more than the critical density, the universe is closed and curves like a sphere; if less, it will curve like a saddle. But there still is a down, evidenced by the fact that you are accelerating in the down direction while falling. Image credit: the Smoot group at Lawrence Berkeley Labs, via http://aether.lbl.gov/universe_shape.html. If you dig straight down from here: You will end up here: This webpage is useful for teaching, geography, maps, entertainment, education, school, K12, antipode, antipodal, the other side of the world, etc. Image credit: V. Springel et al. Every nook and cranny of the universe is filled with myths and mysteries, and the absence of gravity in space is no exception. [NO] thats what happens in space. curvature scenarios. down, falling down, gravity, orbit. Now, the bullet will fall back down, again without air resistance, accelerating at 32 ft./s squared. A Universe that were finite and recurrent would imply that the same structures would appear over and over again in the Universe. If you are not particularly close to any planet but are still in the solar system, down is towards the sun (the barycenter, actually), because that is the direction gravity is pulling you. There is no evidence for any... [+] repeating structures. Defining up will help you understand how meaningless your question is. Image credit: Dr. Zarija Lukic. If you do die in space, your body will not decompose in the normal way, since there is no oxygen. Physics. If you start at rest relative to the sun and are far away from the planets, you will fall towards the sun. What goes up must come down, but it needn’t do so at the same speed. portion of the overall structure. If you go out of our solar system and do not enter another solar system, down is towards the center of our galaxy. Up and down only applies to being on the surface of a planet or object with gravity. It makes you wonder if space could be the same way. Topics: Even so, it doesn’t seem to make sense. Visit The Space Place, and click on "Do spacey things" to do a crossword about a "nine-eyed Earth watcher" that studies pollution in the atmosphere from space. The key would be to look at the Universe on the largest scales and to look for locations where it appeared to have the same properties in different directions on the sky. I have won numerous awards for science writing since 2008 for my blog, Starts With A Bang, including the award for best science blog by the Institute of Physics. The shape of the universe depends on its density. For one, it's only been 13.8 billion years since the Big Bang, and so we can only see the amount of space that 13.8 billion years of light traveling through the Universe and winding up where we are can illuminate. However, that doesn't mean it isn't possible for the Universe to be closed, finite, and for it to fold in on itself the way a Hypersphere or a Three-Torus does. Most of the planet is covered in water, so most diggers will dig into some ocean or another. The pressure from the water would push in on the person’s body, causing any space … If you leave one "edge" of the Universe and return... [+] through another, you just might live in a recurrent Universe. And finally, could it be the case, just as the Earth has two dimensions we can move in on it (north-south and east-west, but not up-and-down), that the Universe might be a higher-dimensional structure like a hypersphere or a hypertorus where the various dimensions are closed and finite, curving back on themselves? Image credit: the Smoot group at Lawrence Berkeley Labs, via http://aether.lbl.gov/universe_shape.html. It's not as crazy as it sounds. Wouldn't that also costs much less fuel since space is a vacuum? Image credit: Dr. Zarija Lukic. Thanks to dark energy and the accelerated expansion of the Universe, it's physically impossible to even reach all the way to the edge of today's observable Universe; we can only get a third of the way there at maximum. This interesting behavior is not due to a lack of gravity, but is due to the fact that they are in free fall. In space if you go straight in space where would that take you 8 comments. Down is therefore towards the earth's center and up is away from the earth's center when close to the earth. Hank answers a SciShow viewer's most pressing question about what happens if the human body gets exposed to space. If you can’t breath, your body won’t stay alive for more than about 30 minutes. Image credit: NASA, ESA, and E. Hallman (University of Colorado, Boulder). If you get out of our galaxy and don't enter another galaxy, down is towards the center of our cluster of galaxies. Image credit: Bryan Brandenburg, under c.c.a.-s.a.-3.0. As far as we can tell, it's flat, non-repeating and possibly (but not necessarily) infinite. I have won numerous awards for science writing. It just means that the expansion of the Universe -- accelerating as it is -- forbids us from ever completing a single "circumnavigation" of the Universe and returning to our origin. Instead of moving in a straight line, the rocket following a curved trajectory. It is the same with astronauts in orbit. This mistaken notion comes from the way we traditionally hold flat maps. Now, suddenly, the entire ground turns upside down (while you are still upside down). Skin is almost completely gas-tight and strong enough to withstand a pressure differential of well over one atmosphere. Also, to make and launch your own bubble-powered rocket, click on "Make spacey things." If you are in space and the earth is the nearest astronomical object, you fall towards earth. Your body would cope better than expected in space without a spacesuit. A simulation of the large-scale structure of the Universe. There are no lines in space either. But it's true: travel about 40,000 kilometers (or 25,000 miles) in any one direction -- over the mountains, oceans and any other terrain you ran across -- and return you would to where you began. Category: Space      Published: October 10, 2013. Since there is gravity everywhere in space, there is also an up and down everywhere in space. It is what happens to you when you ... to letting go of the string," writes Masters. We might think that the Universe is infinite, going on forever in all directions, but the evidence we have for the size and shape of the Universe is very much finite. We usually see only the large ones travel down towards the horizon while the small ones are burnt up long before that (giving the impression of coming from the horizon). Then you would simply fall towards whatever body has the strongest gravity. If you answered that on Earth the objects fall due to gravity, but in space they don’t because there is no gravity, then I’m afraid your answer is far from the truth. I think being as you are on the planet and space probably means escaping the Earth's gravitational pull, from earth, you can go straight up from the position whilst accounting for the rotation of earth with regards the gravity of the sun, or you can go straight up whilst maintaining your position over the Earth's surface. In a hypertorus model of the Universe, motion in a straight line will return you to your original... [+] location. ELI5:What happens if you fly straight down into space or fly straight up? credit: E. Siegel, based on work by Wikimedia Commons users Azcolvin 429 and Frédéric MICHEL. "Down" is simply the direction gravity is pulling you, and "up" is just the opposite direction. Countless children (and adults) have wondered where they would end up if they started digging straight down (ignoring the material and methods). If you didn't age, perhaps you could even wind up seeing the back of your own head just by looking for long enough, as your eyes would eventually encounter the light emitted from your own origin. T a mistake… you will see the exact same thing in every other picture and video a. Not enter another galaxy, down is towards the earth is the nearest astronomical object, you fall towards earth!, this is a BETA experience about 5. to being on the surface of a planet object., ESA, and E. Hallman ( University of Colorado, Boulder ) above our atmosphere, gravity pulls... Return you to your original... [ + ] to where they began fluctuations on various parts the! Also, to make and launch your own bubble-powered rocket, click ``! Make spacey things., orbit the moon in our space ship i get that drop or spill it... 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