Artificial Satellites

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.

A person in an artificial satellite around Earth would experience weightlessness due to the constant freefall towards Earth. They would also see the Earth rotating beneath them, experiencing multiple sunrises and sunsets in a single day. Additionally, they would be shielded from Earth's atmosphere and be able to see the curvature of the planet.

That depends on the purpose of the satellite. Many are in "low Earth orbit", between 120 and 200 miles up. Communications satellites are generally in "geo-synchronous" orbits 23,000 miles high, and GPS satellites are in 12,000 mile orbits. And many altitudes in between.

Satellites are sent to space from Earth to provide various services, such as communication, weather monitoring, navigation, and earth observation. By orbiting the Earth, satellites can collect data and transmit information across long distances. Additionally, they can help facilitate global connectivity and support advancements in science and technology.

An artificial satellite is a man-made object injected into orbit around another object (The Space Station is an artificial satellite of the Earth). A natural satellite is a "natural" object that orbits around another object (The Moon is a natural satellite of the Earth).

Yes, scientists use satellites equipped with radar, laser altimeters, and other sensors to measure the size of polar ice caps. These satellites can provide accurate measurements of ice height, extent, and changes over time, helping researchers monitor the impact of climate change on these regions.

Geosynchronous satellites ('stationary' ones that is) are usually 36 000 km above the Equator, and thus appear to be fixed relative to a given location on earth. They are comm satellites, but because of the distance, the return trip for a signal to them is about 1/4 second. This delay causes trouble with phone comms. You must have been annoyed by those attempts at 'live' TV interviews via such a system.

However, for latitudes above say 55o, the sight path to the satellite becomes closer to to horizontal at that site, and may be blocked by buildings, mountains, etc. To service these latitudes, geostationary satellites are positioned to have their rotation plane inclined to the equator. This improves their performance for comms, but at the expense of them no longer appearing to be stationary in the sky.

Satellites can be equipped with sensors that detect ground movements caused by tectonic shifts along fault lines. By measuring changes in surface elevation or displacement before and after an earthquake, scientists can analyze fault behavior and predict future seismic activity. This data helps improve our understanding of fault dynamics and seismic risks.

The Moon is the natural satellite of the Earth.

The Moon does not have satellites.

A synonym for a natural satellite is a moon.

If the satellite appears to remain motionless over one spot on the earth, then I don't
need to know the radius or anything else about orbital mechanics to calculate its period.
It had better be equal to the earth's rotation period of 23hours 56minutes and about 4 seconds.

The two main kinds of weather satellites are geostationary satellites, which orbit at the same speed as the Earth's rotation and provide continuous monitoring of a specific region, and polar-orbiting satellites, which orbit the Earth from pole to pole and provide global coverage while moving in a more elliptical path.

Some experts argue that there should be a limit on the number of satellites to prevent overcrowding and the creation of orbital debris that hinders future space activities. Others believe that strict guidelines and regulations on satellite launches are sufficient to manage the space environment without a specific limit on the number of satellites.

A satellite will orbit due to a gravitational field, which is formed by the gravitational force between the satellite and stellar body. This force is equal to the product of the gravitational constant, and the masses of both objects divided by the square of the distance separating them.

There are thousands of satellites; most of them change their position rather fast.

There are thousands of satellites; most of them change their position rather fast.

There are thousands of satellites; most of them change their position rather fast.

There are thousands of satellites; most of them change their position rather fast.

Natural Satellites

•They formed naturally

•We perceive information from them

•We have no control over them

•Naturally orbit a planet

•Cannot be used as a weapon

•Influences nature eg waves etc

•Has no life expectancy

Man made satellites

•Humans made them and put them there

•They feed information directly to us

•We control the satellites and can choose the type of information given to us from them

•Go anywhere we choose to send them

•Can be intentionally used as a weapon by humans

•Sends transmissions to Earth

•Has a limited and known life expectancy