Artificial Satellites

Advantages; they always appear to be in the same spot in the sky, so you can focus your satellite dish antenna on them.

Disadvantages; they are quite high, about 23,000 miles up. You need a fairly strong signal to hit them, and a handheld device often doesn't have enough power.

There are hundreds of thousands pieces of man-made material currently in orbit. A few thousand of them are actual useful satellites, things that we want to have up there; stuff like GPS satellites, communications satellites, weather observation stations, the International Space Station, and of course, DirecTV satellites.

Most of them are "space junk"; satellites that have failed, or broken, or out of fuel. Old booster rocket engines. Collision debris, from when the Chinese shot down a satellite and smashed it into 100,000 pieces of litter in orbit, or when one of the Iridium satellites crashed into a Russian reconnaissance bird.

24 active, but there are spares on standby.

ISRO, the Indian Space Research Organisation, was founded on August 15, 1969.

Satellites such as INSAT-4B, Gsat-10, Gsat-15, and GSAT-11 are known to orbit over Mumbai to provide various communication and broadcasting services. Additionally, other satellites from international organizations like NASA and ESA may also have orbits passing over Mumbai for various purposes such as earth observation and scientific research.

France is a part of the European Space Agency and participates in launches by this agency along with other member nations.

The French government has launched 4 reconnaissance satellites: Hélios 1B, Helios 2A, Cerise, and Clementine

In 1929, Russian scientist Konstantin Tsiolkovsky predicted that artificial satellites would one day be able to orbit the Earth. This idea eventually became reality with the launch of the first artificial satellite, Sputnik 1, in 1957.

GPS satellites are used to help us accurately determine the current time and our location. GPS satellites are not directly used to help us predict the weather.

Weather satellites use many imaging and sensing technologies to help us predict the weather, but they are not useful in helping us determine our location.

They are two different types of satellites with two different purposes.

There are many other types of satellites too, such as communication satellites (such as used with Direct TV), space telescopes (such as Hubble) etc.

GRAVITY!!!!

Weather can impact transportation and travel, influence outdoor activities, and affect agriculture and crop production. Severe weather events like hurricanes, tornadoes, and blizzards can also cause property damage and threaten public safety.

It most likely would not be the Earth's gravitational pull. More like the meteor was already shooting towards the Earth or near it enough to head to us. In that case, the Earth's gravity plus the meteor's speed minus the inverse force of the atmosphere equal if it would come down or not. Other than all of that, the poles of the Earth's magnetic force is what pulls meteors in, not the gravity, although it does help. :/

That's true if the orbit is perfectly circular ... which it never is.

In an elliptical orbit, I think you'd have to say that it's falling faster than the

central body's curvature when it's farther out, and slower than the central

body's curvature when it's closer in. (Think of the extreme elongated solar

orbit of a repeating comet.)

But on an intuitive level, the way you stated it is a good description.

Notes: Actually some satellites do have orbits which are described as "circular orbits".

Others have "elliptical orbits".

Of course the Earth isn't perfectly spherical either.

Incidentally, "rate of falling" and "rate of curving" are not really equivalent terms. I guess we know what you mean though.

Gravity keeps satellites in orbit. The closer you are to the Earth, the faster you have to go to maintain your orbit.

At low Earth orbit, the altitude of the Space Station, you make an orbit every 90 minutes. At the Moon's distance you need over 27 days to go around the Earth.

In-between there is an altitude which matches the rate of the Earth's rotation. Many satellites orbit at this altitude.

In a circular orbit with negligible air resistance, the main forces acting on a satellite are the gravitational force pulling it towards the Earth's center, and the centripetal force keeping it in its circular path. These two forces are balanced, allowing the satellite to maintain a stable orbit.

Re = Radius of earth (6.38EE6)

H = Height of satellite (780km => 780,000m)

Me = Mass of earth (5.98EE24)

Ms = Mass of satellite

G = Universal Gravity (6.67EE-11)

V = Orbital Speed

Fg= Force of gravity

Fc= Centripetal force

Use the formula Fg=Fc

(((G)(Me)(Ms))/ (Re+H)^2)= (Ms)(V^2)/(Re+H)

Ms cancel out

((G*Me)/ ((Re+H)^2)) = (V^2)/(Re+H)

Solve for V

V = sqrt( ((G*Me)/((Re+H)^2)) * (Re+H) )

= sqrt( ((6.73EE-11*5.98EE24)/((6.38EE6+780,000)^2)) * (6.38EE6+780,000) )

= 7465.426831 m/s

The first satellite put into orbit was named Sputnik 1. It was launched by the Soviet Union on October 4, 1957.

Yes, there are many artificial satellites orbiting Earth, serving various purposes such as communication, weather monitoring, navigation, and scientific research. These satellites are launched by governments, private companies, and international organizations.

A weather satellite is a type of satellite that is primarily used to monitor the weather and climate of the Earth. These meteorological satellites, however, see more than clouds and cloud systems. City lights, fires, effects of pollution, auroras, sand and dust storms, snow cover, ice mapping, boundaries of ocean currents, energy flows, etc., are other types of environmental information collected using weather satellites. This makes them crucial in predicting developing weather patterns and possibly help predict wather all together.

The US system you're referring to is known as the Strategic Defense Initiative (SDI), also called "Star Wars." It was a proposed missile defense system that was never fully developed or deployed due to technical and financial challenges. While research and development on missile defense systems have continued, the specific concept of using satellites armed with lasers has not been realized on a large scale.

There are at least 24 GPS satellites in operation at any given time with a number of on-orbit spares in case one fails. Each one is in a 12 hour orbit (meaning it takes 12 hours to orbit the earth). They are in a variety of six different orbits and are not just locked into a geosynchronous orbit (meaning they stay over roughly the same place on earth at all times, like your satellite TV and communications satellites) like some satellites.



All GPS satellites are owned and operated by the US Air Force and are controlled specifically by the 2d Space Operations Squadron at Schriever AFB in Colorado Springs, CO. There is not an easy way to deny the GPS capability to our enemies without also denying our own capability, so it is a free system open to anyone that has the technology to utilize it.



GPS satellites carry not only positional data but also extremely precise timing signals, which help the GPS receivers on the ground to triangulate their position and are even used to validate and secure financial transactions, etc. When the system was first created, artificial timing errors were put into the signal to try to reduce the effectiveness of the system for non-military users, but it was removed in 2000.



The GPS satellites also have NUDET (Nuclear Detonation) sensors on them to detect nuclear detonations almost anywhere on earth.



To use GPS you need to be in clear view of at the very least 3 satellites but you should be in view of 6 satellites at any given time unless some are blocked by objects, mountains, etc. So, GPS usually doesn't work well in-doors or even in a forrest or valley at times.

The altitude of a satellite that takes 90 minutes to complete its orbit is approximately 680 kilometers above the Earth's surface. This type of satellite is known as a Low Earth Orbit (LEO) satellite and is commonly used for applications such as Earth observation and communication.

sending information back to Earth for processing and analysis by scientists on the ground.

As a satellite gets closer to Earth, the force of gravity acting on it becomes stronger. This can result in an increase in speed and a change in the satellite's orbit. Ultimately, if the satellite gets too close, it may enter the Earth's atmosphere and burn up upon reentry.

No. To remain in orbit it needs to have a certain speed, and that speed will only match the surface speed of the earth on a certain height. To go lower it'd have to go slower, and then it'd fall.