How are space navigate vehicles different form land based?
79516
engines for space craft don't need to constantly exert forward thrust to keep going, like airplanes. They need to to escape the earth's gravity, but once cleared, they can keep going on forward momentum, using brief propulsion to correct the course of the space craft. \n\nMars and the moon cannot use gasoline based craft, there's no oxygen to burn, so they likely need electric motors, maybe solar powered. Not exactly sure on this but I would say an electric motor of sorts.
6157
In order to create any sort of system for describing movements around a sphere, you need to choose some fixed reference point somewhere.  In the case of the standard system for describing movements on the surface of the Earth which you're talking about, the point that's been chosen is the North Pole (& its sister the South Pole).  This creates north/south movement, which is movement towards either one of these places.  East/west movement is a different sort of movement which can be described within the same framework-- movement along imaginary parallel lines placed perpendicular to the up-down orientation you're imagining. \n \nIt's all arbitrary.  You could imagine a system where there's a direction-- let's call it Glork-- that leads directly to your house.  If you go "all the way" Glork, you get to your house.  If you go "all the way" Anti-Glork, you get to the point on th Earth which is directly opposite your house.  And there are two directions of movement, analogous to east and west, where you move on around the planet on parallels perpendicular to Glork and Anti-Glork.  Same deal. \n \nAs to the history of our particular convention on directions, it helps to understand that when it was invented most people didn't understand that the world is a sphere.  So, to them, it was just the four functionally equivalent directions that you get on a 2d surface. \n \n<3
68709
I see you're asking about the New Horizon's (Pluto) mission. A "straight Line" flight path is actually a linear curve due to the nature of space. The spacecraft will not travel a straight line to Pluto but will use Jupiter, and it's gravity, to boost the speed at which the craft can travel. When you're talking about distances of this magnitude even very small allowable deviations (.02%) must allow for in-flight navigation corrections. It isn't the speed, it's the distance travelled.
126845
Space craft [usually] rely on rockets in space.  Rockets burn some fuel with some Oxidizer to produce lots of hot expanding gasses which are pushed out of the nozzle of the rocket.  When these gasses are pushed out the back of the rocket, they cause a change in momentum which accelerates the rocket forward.\n\nNewton’s 3rd law states, for every action, there is an equal and opposite reaction.\nSo if the action is that the rocket exhaust is pushed out the back of the space craft, then the equal and opposite reaction would be for the space craft to be pushed forward.\n\nThe law of conservation of momentum tells us that momentum is always conserved.  If a spacecraft is moving with some initial velocity (could be zero) that space craft has some momentum associated with it.  At any point in time later on, the momentum of all the parts to that space craft needs to equal up to that original value.  So if part of the craft (the burning fuel) is pushed out one direction, in order to conserve momentum, the other part of the craft needs to be pushed the other direction [otherwise it is breaking the law].\n\nIt is somewhat of a difficult concept to understand, I hoped I explained it well.\n\nRockets do not just work in space.  Obviously you can still use a rocket down here on Earth and it works for the same reasons it work in space.  The principle of how the rocket works is not just exclusive to rockets.  For example, if you sat on one of those chairs with wheels holding a heavy bag of sand, then you pushed/threw the bag away from you, you and the chair would start to move in the other direction.
861730
Geo satellites have a proscribed speed since they must orbit in the equatorial plane of the planet to be stationary in the sky relative to points on the earth.  \n\nPolar orbits can be at any altitude, so the speed will vary depending.
471754
Scientists don't have all the answers, but current theory says migrating birds have a "map and compass" system. The map gives them location and the compass provides direction. They may use observation and memory, and hard-wired (instinctual) information for the map. There are believed to be 5 basic navigation mechanisms: steering by the sun; steering by stars; biological-magnetic map (for location; is sensitive to magnetic disturbances); magnetic map (for direction); and odor map (for short distances). See the ref. for details.
60306
hi there, you asked a nice question. \na simple-straight answer in layman terms to this would be that Mars Rover is remote-controlled from NASA.\n\nfor a more complex answer i would cite a website -\nThe rovers "talk" to Mars Odyssey and Mars Global Surveyor, which are constantly orbiting the red planet. In the 16 minutes it takes each orbiter to go from horizon to horizon, there is an opportunity for the rovers and orbiters to "converse" for about ten minutes.\nThe orbiters, with their more capable X-band communications systems, can transmit data back to Earth at a faster rate. This high performance is critical, as time on the large antennas here on Earth that were built to receive the data (the Deep Space Network) is limited given all of the spacecraft that rely on them.\n\nNow these telecommunication can be used to transfer data as well as give control commands to the Mars Rover, and this can be done by anyone who has access to NASA system.
6045
There are actually, typically multiple scales to an Earth-orbit launch window, one being on the order of days long and the other being a time window within each day.  Furthermore, windows for interplanetary shots may open only every several years.  Besides fitting in with all the external time constraints (other launches, weather, etc.) you basically have to compute the window of time the launch site (LS) will be in a relationship with the desired final orbit to allow achieving it within propellant constraints.  For instance, if this is other than an equatorial orbit the launch must wait until the LS is near the orbital ground track (going in the desired direction).  There are many other constraints and considerations affecting the window, such as type of orbit, solar heating, and so on.  See the ref. for a lot of useful info.
347023
If you jump, you will be moving at the same speed as the vehicle just before you left the floor.\n\nWhen in the air, if the vehicle is accelerating, the vehicle will move forward faster than you and consequently, you will land some distance from where you jumped and vice versa.\n\nIf on the other hand, the vehicle was not accelerating, you will land at the exact place you jumped from. Of course, this is not counting air resistance.
299176
They may work together if the GPS and Autohelm are compatible.  You can get the instructions manual off the Raymarine website.  If your GPS is to old it may not work.  What GPS do you have?\nAlso some of the older auto pilots were just designed to use with a compass course and not with a GPS.\n\ncheck out \nhttp://www.raymarine.com/raymarine/Default.asp?site=1&section=3&page=657
881554
Properly named "launch vehicles", these are a class of rockets which are used to launch satellites into earth, moon, sun, or planetary orbits, or, to lauch interplanetary payloads to objects in our solar system.\n\nA launch vehicle can be manned or un-manned. Unmanned vehicles are usually referred to as "Expendable Launch Vehicles (ELVs)", since most of the vehicle is not recovered for re-use. \n\nExamples:\nELVs: Atlas-Centaur, Titan-Centaur\nManned: Shuttle, Saturn V\n\nMore on rockets from Wikipedia:\nhttp://en.wikipedia.org/wiki/Rocket\n\nHope this helps!
374997
The sun is the larger object. So, it has more gravity. The earth moves around the sun and centrigfugal force keeps it going around rather than crashing into it. It continues to move because there is no gravity or atmosphere in space to slow it down. Once a spaceship or rocket leaves the earth's atmosphere and pull, it keeps going even without its rockets on. It just keeps going in the direction it was pointed. \n\nTo learn more, see http://spaceplace.nasa.gov/en/kids/phonedrmarc/2002_july.shtml
66389
Their navigation method relies on a light source at a great distance -- the sun or moon. If they are flying in a straight line, the angle between their direction of travel and the light source remains constant.\n\nWhen the light source is close, as they fly in a straight line, the angle changes. When they make a navigation correction, they start to circle the light source and spiral into it.\n\nTo see this, suppose at 8:00 tomorrow morning, you go out and walk keeping the sun 45 degrees to the left of your center. Since the sun is in the east, you will pretty much be walking southeast. You can go a long time before the movement of the sun causes you to change your course very much.\n\nThen find a lamp post, keeping it in a position 45 degrees left of center start walking. You won't get very far before you have to turn to your left to keep the lamp post at 45 degrees. As you continue to walk, you will spiral into the post.
1159975
No.  I think it can be generalized that humans judge motion in two ways.  First, a physical reaction; feeling a car on the road, or wind in your face.  Second, a visual reference; such as trees buzzing past or a familiar landmark getting closer.\n\nSince there is no "atmosphere" to speak of in orbit (at least not what we'd consider an atmosphere anyway), there is nothing physical to oppose his motion.  Therefore, from his perspective, he is just sitting there.  Also, since the shuttle that he's tethered to is also moving at the same speed, it doesn't appear to move either (unless of course the astronaut is moving toward, away from, or parallel to the ship somehow).  Regardless, with no frame of reference, there is no sensation of motion.\n\nWell, what about the Earth?  Surely that is a frame of reference.  Well, yes and no.  Sure, one could look at the rotating Earth below them and get some sense of how fast they were moving.  However, anyone who has taken a road trip and has been driving towards a mountain range (i.e. driving across Nebraska towards the Rockies) knows that something that far away and that large can fool the senses into believing that you've stopped.  Therefore, I would (and this is an opinion) discount the Earth as a frame of reference.
355414
Hey,There is too much term relates to ILS. I am working on the Instrument of Landing System in my navigation courses. If you were looking for such information. I do have tones of the data i collected. Please specify you ILS. Good luck Fellow
280572
The Star Wars project was pretty far fetch given that it intended to intercept ballistic missiles using a satelite mounted laser weapon. However, there are many elements to missile defense that have proven very successful and already showed their benefits. This include interceptor missiles launched from sea and land with capability to intercept anything from short to long range ballistic missiles as well as guided missiles.
650019
The landing method may have something to do with the design shape. The American capsule landed in the ocean and a conical shape makes it float up-right. The occupants then had to wait in the capsule to be recovered. The Russian capsule lands on dry land and the occupants can immediately exit the vehicle and wait to be picked up, therefore, no need for the conical shape to remain up-right. Those reasons, along with differing design philosophies are probably the only reasons for the difference.