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Artificial Satellites
Artificial Satellites are objects launched from earth to orbit earth or other planets. Satellites are used for communication, remote sensing, weather forecasting, and other purposes. This category is for questions about satellites in general or specific satellites.
1,932 Questions
Where can one purchase Iridium satellite phones?
Satellite Phones can be purchased in many places. The best place to find one at a great price is probably online. While online is the best there are some physical camping, hiking, climbing stores where one can find a satellite phone.
Satellites: it is an object that has been placed to orbit by human. They are launched to do specific job.
by: shiela mae aloot
How signal is transmitted to the satellite radio and receive back to earth?
A satellite is like a mirror in the sky. Only instead of reflecting light, it "reflects" radio and television signals. There are receivers and transmitters in the satellite, so what it receives on one frequency (or channel) can be then re-transmitted back to earth on another frequency. Its like sending out signals from a tower that is many miles high to reach out to a bigger area. Only without the tower!
Is it possible to see artificial satellite in night sky?
Yes, that is often possible. Preferably go to an area without streetlights and watch the sky. You will soon see fast moving shiny objects. These are satellites.
Why polar satellites are used?
Their orbits (and the rotation of the earth) will eventually bring them over every point on the earth's surface. This is useful for "spying", certain weather observations, etc.
Other orbits will always miss large areas of the surface.
Why did the ability of Russia to launch a satellite into space scare the U.S. so much?
It didn't "scare" the US, they already had a satellite planned, a much more capable one. They just didn't rush to get it launched first.
Which is the artificial satellite of Pluto?
Pluto has no artificial satellites. We have never placed any satellites in orbit around Pluto, other than the New Horizons spacecraft, which was sent to do a flyby observation of Pluto for a short time, and then move on to Kuiper belt object (486958) 2014 MU69.
What is the relationship between satellite altitude and the time needed to complete on orbit?
You need to know a little physics here. The force on the satellite (mass m) is F = GMm/r^2 where M = the mass of the planet, G the gravitational constant and r the distance from the centre of the planet.
From Newton we know that force = mass X acceleration. When you study circular motion you will learn that the acceleration of an object moving in a circle is rw^2 where w = angular velocity (radians/ second). A radian is nearly 60 degrees (actually 180/pi) so there are 2.pi radians in a revolution.
There is therefore a relationship between w and T (time for a revolution) in that T = 2.pi/w.
So we can write m.r. 4.pi^2/T^2 = GMm/r^2
The mass of the satellite cancels out (just as well) and so by rearranging we get
r^3 . 4.pi^2 / GM = T^2 - which gives you Kepler's law.
Since we can measure r and t very easily we can work out GM very accurately as a product (much more accurately than we can measure G or M individually)
The maths is complicated by the fact that the satellite will probably be moving in a slightly elliptical orbit (in which case we replace r by the semi-major axis) and is also affected by variable density of the rocks of the planet (this is very noticeable in satellites going round the moon)
Why does a satellite eventually slow down and eventually fall down to Earth?
Because Lewis got real greedy and ordered 42 kg of cheese and it was too much for the moon vessel
What is the exact time taken by the polar satellite in one revolution of earth?
Polar satellites, orbiting over the polar region (first link), takes approximately 100 minutes to do one complete pass at 25-degrees Earth rotational difference, to map the full section.(second link)
For other satellites, it can take 90 minutes just to re-position a satellite to cover a new region, and THEN begin mapping. But the polar satellites stay in a constant orbit.
What atmosphere do artificial satellites orbit?
Artificial satellites orbit primarily in the Earth's atmosphere's upper layers, including the thermosphere and exosphere, where air density is extremely low. While they are above the majority of the atmosphere, some satellites can experience drag from residual atmospheric particles, particularly at lower altitudes. Most satellites operate in orbits ranging from a few hundred kilometers to several thousand kilometers above the Earth's surface, well above the significant atmospheric effects.
Yes, satellites can be considered a type of media as they facilitate the transmission of communication signals, including television, radio, and internet data. They enable broadcasting and streaming services to reach wide audiences across the globe, playing a crucial role in modern media distribution. Additionally, satellite imagery is used in various media contexts for news reporting and environmental monitoring.
How are the satellites able to float in mid air?
they do not float. They are spinning with a certain velocity. First of all the satellites when launched are propelled through air at a speed equal or greater than its escape velocity.They then have a certain linear velocity but are able to maintain a lunar synchronous orbit because of the earth's gravity.
How many military satellites orbit earth?
Thousands, but the actual number is classified and varies from week to week as satellites de-orbit and new ones are launched.
