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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
How fast do a GPS satellites travel?
This actually depends on the orbital radius, or distance from Earth's surface (or center). The further away the satellite is, the slower it travels to stay in orbit (related to Kepler's second law). A satellite that is really close to the atmosphere and barely in space needs to travel at about 7800m/s. A satellite can speed up and increase its tangential velocity to make its orbit bigger. A bigger orbit results in a lower speed. Interestingly, this means that an orbiter speeds up to slow down. Likewise, a satellite in a high orbit can fire its engines backwards to reduce its speed to get into a smaller, faster orbit, ultimately speeding up.
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In an orbit that's not a perfect circle, the speed in orbit is always changing.
The satellite moves faster when it's closer to the Earth, and slower when it's
farther out.
What country was Sputnik 1 launched from?
Sputnik-1 was launched from site No.1, at the 5th Tyuratam range, in Kazakh SSR (now at the Baikonur Cosmodrome) Kazakhstan, former Union of Soviet Socialist Republics (USSR).
Sputnik 1 was launched from Gagarin's Start which is the 5th Tyuratam range, located in Kazakhstan (A country of west-central Asia, south of Russia) where the Baikonor Cosmodrome is now.
The Union of Soviet Socialists Republics (U.S.S.R.)
What were the advantages and disadvantages of the Apollo spacecraft?
* interesting and varied training and activities.
* good pay rate.
* wide recognition and respect in society.
* working as part of a team.
* incentives for highly motivated individuals to achieve.
* highly dangerous work whilst on a mission
* long and demanding hours
* living place determined by where you are based
* long periods of time away from family
* invasive tests and experiments at times.
* high competition for few available positions.
* loss of privacy if well known.
What is coverage angle in satellite communication?
The coordinates to which the earth station antennas must be pointed to communicate with the satellite is called Look angles.
There r 2 types of look angles:
1. Azimuth angle: Measured eastward from geographic north to the projection of satellite path on the local horizontal plane at the earth station.
2.Elevation Angle: Measured upward from local horizontal plane at the earth station to the satellite path.
Where is telephone country code 881?
Country code +870 (dialed as 00 870 from many places) is used for Inmarsat satellite phones, including ship-to-shore.
Note: charges for calling +870 are substantially higher than most international calls.
(Inmarsat previously used +871, +872, +873, and +874 for satellite phones in specific parts of the world, but those codes have been retired in favor of the single code +870.)
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Why you use microwaves in satellite communication?
Microwaves are used in communications because of their shorter wavelength and smaller antennae. This allows them to be more directional than lower frequency radio waves. The Microwave spectrum also has more bandwidth than the radio spectrum. They also waste less energy than Radio Waves
What is the similarity between a natural and artificial satellite?
The difference between an artificial satellite and a natural satellite is on how they are made. Electronic Satellites that are made by man launched into space are Artificical Satellites, while the Moon which is not artificially made are called Natural Satellites.
What country in what year launched the first satellite into space?
After several failures by both the USA and the USSR, the first successful
artificial satellite was launched from the USSR in October, 1957.
How tall is the sputnik satellite?
Sputnik 1 was launched on October 4, 1957. The satellite was 58 cm (about 23 in) in diameter and weighed approximately 83.6 kg (about 183 lb). Each of its elliptical orbits around the Earth took about 96 minutes. Monitoring of the satellite was done by many amateur radio operators
What are the benefits of an iridium satellite phone?
Calling an iridium satellite phone depends upon which country one is calling from. If one is calling from the United States, he/she must dial the prefixes 011--8816 followed by the eight digit phone number. However, if one is calling from a country such as Germany or Mexico, he/she would instead use the prefixes 00-8816. Australia, for instance, uses the prefixes 0011-8816 to dial an iridium satellite phone.
Why do satellites light up at night?
Because they reflect sunlight at Earth as they fly over head. That is why when you see one, it starts barely able to be seen, gets brighter and then dims until you cannot see it. It is not long reflecting light towards you any more.
What is the purpose of a communications satellite?
The purpose of communications satellites are to provide telecommunication for companies around the world. In addition, communication satellites are also used for mobile applications such as communication to ships, vehicles, and planes.
Why are ground stations in continuous contact with satellites in geostationary orbit?
Just imagine managing a system of communication satellites which were non-geostationary. Data needs to be sent to one city, one home, but the satellite for the job is different every time. The task would be manageable, but unnecessarily difficult.
Further more, metropolises must have priority over small towns- or oceans. New York needs more satellites than Apple Creek Ohio or the Atlantic Ocean.
Finally, many satellites serve a very specific audience. Your favorite radio station would almost never come into reception if the satellite broadcasting it is circling the world.
When was satellite communication invented?
In 1957 when the Russians sent up the first earth orbiting satellite, Sputnik.
It sent out a radio signal which was nothing more than a beeping sound spaced about a second apart, if my memory serves me correctly. People all over the world tracked the beeps, which seemed to have not contained any data at that time. More than likely, it was just a tracking signal.
I remember as a youg boy getting up around 4 am to see it as it flew over. It was just a bright but tiny dot moving across the night sky. Kinda scary at the time, but look what it started.
What are the two most common ways that a satellite is launched into orbit?
Riding on a rocket and riding in the cargo bay of a space shuttle
When was the first satellite of India launched and from where?
Aryabhata was the first satellite launched by India. It was launched on April 19, 1975 from Kapustin Yar. The satellite got its name from the Indian astronomer.
What country placed the first man first woman first animal and first satellite in space?
The Former Soviet Union, Also known as The USSR ( Union of Soviet Socialist Republics )
Now known as The Russian Federation.
When was the first us satellite put into orbit?
The first artificial Earth satellite launched by the United States was "Explorer I".
It was launched from Cape Canaveral, Florida, on Friday, January 31, 1958 at 10:48 PM Eastern time. The payload was assembled in 84 days and the Vanguard rocket modified to launch it. America had been 'burned' by the October, 1957 launch of the Russian "Sputnik I" (as well as two more satellites in late 1957), and was eager to put a satellite in orbit.
Explorer 1 weighed less than 30 pounds. It carried a few scientific experiments and two radio transmitters to send the results back to earth. The experiments and radios were battery-powered since solar power in space was not yet developed. Explorer 1 went silent on May 23, 1958 and burned up on re-entry March 31, 1970.
The Soviet Union launched an aitificial satellite into orbit before after the US launched one?
Who tried first isn't known, but the then Soviet Union were the first to succeed in getting a satellite into orbit with the sucsessful launch of Sputnik 1
As a result, President Kennedy made his famous speech that promised to put an American on the moon in 10 years time.
What was size of sputnik 1 satellite?
Not sure what you're asking... technically Sputnik was a part of the Russian space program (like Apollo was part of the U.S. space program). Sputnik in Russian literally means "co-traveler" or "satellite".
The program started in 1957 with Sputnik 1 (about 23 inches in diameter, weighing in at about 183 lbs). Sputnik 2was a 13' by 6.6' cone shaped capsule, large enough to carry the first living animal in space (a dog named Laika). Sputnik 3was a slightly smaller cone (11.7' x 5.6').
