just want to know how fast is this world travellinng through space, no one gives a simple answer  20000kmh????  an old saab motorcar advert used to say that this planet was traveling at a certain speed, plus the speed of one of it's jets was so and so, I've had many an arguement with people who say we're stationary exept for the gravity speed, and tilt  etc, that's not what I want to know.How fast are we travelling through the universe if you like.
210475
Earth's speed changes from time to time.  The average is 29.783 kilometers/second or 107,218 kilometers/hour.
312536
*sighs* Why can't people do any research on their own? Anyway... you are traveling through time right now, how else did you push those keys in sequence to form your question?\n\nI think that what you are attempting to refer to (lol I'm never gonna get a best answer replying like this) Is that as you travel faster and faster, closer and closer to the speed of light, time flow for you slows down, and the misconception of the public that if you go faster than light you will reverse time. WRONG!\n\nThat's not specifically what you asked though, so I will focus on teh misconceptions regarding the speed of light. First of all, accelerating mass to the speed of light is impossible as it would require an infinite amount of energy, so your question is meaningless. Second, since your question is meaningless tehre is nothing more to say except maybe a supporting and enlightening example. Third, I do not feel creative tonight so that example is gonna have to pass tis time, unless you email me and I will explain it better.\n\ndavid_lapierre@sbcglobal.net\n\nUnless this is just a school project, which I doubt since they are going donw the drain is sciences these days... you might wanna ask me a question, I can be very helpful when I know my time is not going to be wasted on a person who won't bother to take a few minutes to learn something... :-)
450167
The question deals with the expansion of the Universe, with the simplifying assumption that the object asserted to have an expansion speed away from us (by measuring its red-shift) has ALWAYS been traveling at 3,000 km/sec, and that its (known) distance is 50 Mpc.\n\nHowever, your requested operation is inverted!  That is obvious since any number of Mpc's (a length) divided by a speed (km/sec) will give one a time, but yours, quite the opposite, will give you 1 over a time.  Personally, I prefer my wristwatch to measure time t rather than t^(-1), but hey, if you could develop that, there might still be someone out there who'd want to buy it!\n\nLive long and prosper.
663818
From the physics point of view, our universe thus far is approximately 15 billion light years and expanding every second. Light year is the distance that light with the speed of nearly 300,000 Km/s travels in one year. This distance equals 9, 500, 000, 000, 000 Km (that light travels each year). Now, imagine how big our universe is!!\n\nAbout the second part, The space-time (space and time are inseparable) make our universe. They are both dynamic and the  fact that universe expands means both the space and the time expand. Now, in what do the space and time and our universe expand? This fact is not like other daily facts in our life, it is not possible to assign a place for space-time so that our universe expand in it. We cannot say there is something outside our universe because it is meaningless. These concepts are complex and require in-depth studies and deliberating.\n\nI hope these would be a little helpful...
75471
Air inside the car is travelling at the same speed as the car. So for a fly, the car is not moving.\n\nThe Earths rotates at a speed of 1000 miles/h at the equator. If you jump why don't you fall miles away? The answer is the same, the Earth is the car and you are the fly.
12201
Approximately one rotation every 24 hours [grin].\nBut, seriously though, the Earth's radius (at the equator) is\n6380 km so the equatorial circumference is about 4 x 10^4 km,\nso the speed of the earth's surface (at the equator) due to the earth's\nrotation is 4 x 10^4 / 24 = 1700 km/hr.\nAs an exercise for the reader, compute the speed for your particular\nlatitude.\n\n1. What is the Sun's rotation speed around center of the galaxy? \n\nThe disk of our galaxy is flattened by rotation (just as the planet Saturn is flattened, and protostellar disks are flattened.) Individual stars in the disk are on nearly circular orbits in the plane of the disk, all revolving in the same direction around the center of our galaxy. (By contrast, stars in the halo are on elongated orbits, at random orientations, some traveling clockwise, and others counterclockwise.) \nThe Sun, for instance, a fairly typical disk star, is orbiting with a speed\nv = 220 km/sec = 0.000225 parsecs/year.\nThe radius of the Sun's orbit around the galactic center is\na = 8000 parsecs.\nThe circumference of the Sun's orbit is then\n2 pi a = 50,300 parsecs.\nThe orbital period of the Sun thus turns out to be\nP = 2 pi a / v = (50,300)/(0.000225) = 220,000,000 years. \n\n2. What is the speed of center of our galaxy?\nThe sun is about 26,000 light years from the centre of the milky way
89821
you are confuse because you use the earth day as reference to your question. WHy not use this one.\nspeed of light is 299,792,458 m / s (from google) and \nspeed of the earth's rotation is 1000 miles per hour (http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970401c.html).\nIt is obvious that speed of light is faster that the speed of earth's rotation.\nAnd another thing...there is no day in space because you have no source of light as reference. The term day is because of the sun of the solar system, in which we have 24hrs to 1 complete rotation of the earth.\nHope you are enlighten.\nyou just confused yourself because you used the earth's day which is 24 hrs as your reference.
540167
No matter how fast you go or think you are going, light always appears to be going the speed of light.\n\nEven if you are going 0.99999999999 c from the viewpoint of an outside observer, you would still see light traveling at the speed of light around you. Now, light sent by objects moving at 0.9999999999 c towards you (those "ahead" of you) would be severely blue-shifted and light from objects moving away from you at that speed (those "behind" you) would be severely red-shifted.\n\nBut light from any object moving the same speed as you would look perfectly normal. In fact if you covered the windows of your spaceship (it better be a spaceship, since you won't be in any atmosphere for very long), you wouldn't know you were moving at all!
539152
It depends where on Earth you are.\nAt the North Pole, you're not moving at all (at least in this frame of reference - you're still moving with the Earth round the Sun, with the Sun round the Milky Way, and so on), just spinning on your axis.\n\nAt the Equator, you travel the circumference of the Earth, approximately 40,075km, in 23 hours 56 minutes (a siderial day), giving you a speed of 1674 km/h or 1,040 mph.\n\nAt other points, your speed will be somewhere in between.
5722
Light travels roughly 186,000 miles per second. Einstein once said that nothing can move faster than light, and this previously was an accepted truth because visible light was considered to be just a wave of energy. However, when studying how light reacts to strong gravitational pulls, such as one from a black hole, we can see that it bends under gravity. This indicates that it shares some characteristics with matter. It could even have a minute amount of mass. If light shares characterisitcs with matter, then we can harness it and use it the same way we do air in a jet engine. Can we not go faster than the wind naturally blows with a jet engine? Yes. Then I do not see why we can't go faster than light when harnessing light itself as energy.  There have been several questions like this, and I really feel that traveling faster than lightspeed is only decades away.
586142
The Earth is about 12,750 kilometers (km) in diameter.\n\nHere are some answers to some more of your questions:\n\nHow old is the earth?\nThe earth is about 4.5 billion years old. That is 45,000,000,000 years. The sun, the moon, the planets, and nearly everything in our solar system was formed at the same time, so they are all 4.5 billion years old. \nHow does the earth spin?\nIf you look around at planets, stars, and galaxies in the universe you will see that EVERYTHING spins! This is because planets like Earth (and stars and galaxies) formed from a large cloud of gas and dust. As gravity pulled the cloud together, any little bit of spin gets multiplied. This is known to scientists as the Conservation of Angular Momentum. You can try this out yourself. Find a chair that spins easily and sit on it. Start out by spinning with your arms outstretched, then pull them in to your body. Did you notice that the chair started to spin faster when you pulled your arms in? The same thing happens as the planet forms — as its gas, dust, and rocks fall together the planet spins up faster and faster. Later other things can affect the spin. Earth and the moon pull on each other, affecting both their spins and the orbit of the moon. It's quite a dance! \n\nHow fast is the earth spinning and why can't we feel it spin?\nThe circumference of (distance around) the earth is 2 x PI x radius, which turns out to be about 24,000 miles. Since the earth turns once per day (or 24 hours), that is 1,000 miles per hour! We don't feel that because everything else is moving with us and because the motion is very, very smooth. It's kind of like sitting in a car and reading a book or playing a game. If the car is going very smoothly, with no stops or bumps, and you don't look out the window, you wouldn't know you were moving. The only reason we know the earth is turning is because the sun and stars move across the sky. \n\nWhat is the exact tilt of the earth? How much does it change throughout the year?\nThe tilt of the earth is 23.45 degrees. This is measured as the tilt of the earth's equator compared to its orbit around the sun. The amount of the tilt doesn't change with time, but the direction that the earth's poles are pointed does. This is called precession. It is just like the wobbling of a spinning top. The direction that the North Pole (and South Pole) is pointed moves in a circle in the sky very slowly, completing each circle once every 26,000 years. \n\nWhy does only Earth have so much oxygen?\nThat's a very good question — no other planet in the solar system has so much oxygen. The answer is — life! Earth did not originally have a lot of free oxygen in the atmosphere. The oxygen was mostly combined with other elements to make carbon dioxide, water, or in rocks. But as early life evolved, especially plants, well they give off oxygen. So the reason we have so much oxygen in our atmosphere — and we are here and can breathe it! — is due to plant life on the earth! \n\nHow can rockets get through the earth's atmosphere, but comets can't?\nObjects hitting our atmosphere usually burn up because they are hitting it so fast. Usually they are moving at hundreds or thousands of miles per second. Rockets and the shuttle move more slowly (although pretty fast compared to cars on the highway). Here's a comparison. If you jump into a swimming pool from the high board and hit the water really hard, it stings and you make a big splash. But if you step into the water slowly, it feels fine and you make only a little ripple. The same thing happens to meteors — they hit the earth's atmosphere real hard and go splat! \n\nIf a comet hit the earth, what would happen?\nIt could cause a big explosion. The nucleus of a comet is thought to be a mile or two in size. The nucleus is made up of ice and rock, but we aren't sure how solid it is. Something that big hitting the earth from space would be bigger than
72375
Because planets are actually moving in relation to stars.  They are orbiting the sun.  They are also a lot closer to us than stars.  For example, when you drive, you see mountains in the distance.  You are passing those mountains at 65 miles an hour.  They appear to be going by very slowly.  But when you pass a light pole right next to you at the same speed, it appears to whizz by really fast even though it's the same speed.
600608
Moving faster than light isn't really the real issue for space travel as traveling AT the speed of light solves all the distance problems(unless you are interested in time travel!). Of course that in itself is a big challenge. If one could demass the vehicle then surely one could achieve the speed of light!!! Afterall photons do travel at this speed.\nBut we would do very well even with speeds like .99999c because time dilation will reduce the time required drastically. Have the science, just need the technology!
18090
You've hinted on most of the problems related with travel at extreme speeds.  In my view it isn't possible with our current technological and scientific knowledge, here's why:\nWhen you drive a car at 30 mph you require a certain amount of enery to sustain that speed.  If you double your speed you more than double your energy requierements, because of friction between your car and the surrounding air as well as your tires and the road. Even if you had no tires (the equivalent of a perfect hipothetical electronagnetic propulsion) you'd still have wind drag.  The same happens in space, which is not completeley devoid of matter.  You would require enormous amounts of power to increase speed by small amounts once you really got going fast.  Actually, you would probably  require more energy than the energetic output of our entrier Solar System, depending on she size and acceleration of your vehicle, maybe even more than that of the entire galaxy.  The material out of which your spaceship is made would melt, burn or crack and other side effects like increased weight and dimensions (Einstein and Lorenz based) would have almost unforseable effects on the spaceship.  The only way of reducing this would be to travel in a circular or almost circular trajectory with modest accelerations, it would take almost a year for you to reach extreme velocities at a 1g acceleration.\nSumed up: you would require more energy than the planet can provide and the material of your spaceship would have to de made of a susbtance not yet researched.  Even solving these two (the solution of which could be centuries away - or maybe just decades, who knows, but it's not at hand) we'd have to deal with Einstein and Lorenz side effects on weight and dimensions, to attain 97%+ light speed (180,000 mps).
229022
There are numerous problems with your assertion: you measure the universe's size using the farthest object viewed from earth (13.7 billion ly).  Then you assume (from your equations) that earth is at the center of the universe (a somewhat egotistical idea), also, you forget to measure in the opposite direction (galaxies are visible at 180 degrees of the one observed to be 13.7 billion ly from here). Add to all these your interesting equivalent of the speed of light...apparently you believe the speed of light to be somewhere around 34.2 meters per second (a mere 226.4 times slower than the space shuttle).  If you are going to try to figure out the size of the universe, do a little more research and brush up on your math...for example: \n\n"From new data collected from a space probe examining the Cosmic Background Radiation, astronomers estimate the universe is at least 156 billion light-years wide. Actually, it’s long been known that the universe was a lot wider than 27.4 billion light-years; this latest research tells us how much wider.\n\nAccording to researchers writing in the journal Physics Review Letters, the universe must have expanded much faster than light in its early stage." *\n\nSo take into account that one light year is 9,467,280,000,000 km ** and you get...\n\n1.476895680 x 10^24 km\n\nthat's 1 octillion, 476 septillion, 895 sextillion, 680 quintillion kilometers wide (or 1 quadrilliard, 476 quadrillion, 895 trilliard, 680 trillion kilometers wide for those following the European system of counting)...and that disregards the continued expansion since the observations.\n\nOf course there are also quite a few scientists who affirm that the universe is infinite, so, in the end, nobody really knows.
37677
Your thinking is correct! There's a phrase that's unfortunately left out when we read about the universe -- "observable universe." We see a galaxy 13-billion light years distant as it was 13-billion years ago. During the 13-billion years it took light from there to reach us, that galaxy has moved beyond the limits of the "observable universe." Remember, the farther away a distant galaxy is when we observe it, the faster it's rushing away.\n\nIn the case of the galaxy 13-billion light years away, it's recessional velocity is 3^11 km/sec. That's NOW. But in the 13-billion years it's taken light to get here, that same galaxy has moved another 1.2^16 light years farther away, and that puts it well beyond the limits of the "observable universe."
424569
Oscar. You have written too much. This 125m tower stuff does not matter compared to r=6.38*10^6. Why is this talk about 1.00 km and angle theta? See what “zipper” above says. Besides I answer your last question << Why is the trajectory of the cannonball not parabolic?>>. Why should it be if both you and Newton demand it to be circular? Assume that V1 of cannonball is the 1st cosmic speed corresponding to a circular track. Let V2 be > than V1, then you receive an oval track. Take V3 > than V2, then the track may become parabolic, so that cannonball would never return back to the cannon to linger out among planets and stars. If you are intrigued calculate a set of velocities and corresponding orbits of the cannonball. If cannon is not available consider a football! I like your inventive wits – to be honest!