Satelittes

fiveofthebest.podomatic.com
new episode 12 th march
still traveling and having little trouble,  will try to add pics tomorrow
 
 
Satelittes
 
 

 
 
Satellites operate in extreme temperatures from −150 °C (−238 °F) to 150 °C (300 °F) and may be subject to radiation in space. Satellite components that can be exposed to radiation are shielded with aluminium and other radiation-resistant material
 
 
Communication satellites range from microsatellites weighing less than 1 kg (2.2 pounds) to large satellites weighing over 6,500 kg (14,000 pounds). Advances in miniaturization and digitalization have substantially increased the capacity of satellites over the years. Early Bird had just one transponder capable of sending just one TV channel. The Boeing 702 series of satellites, in contrast, can have more than 100 transponders, and with the use of digital compression technology each transponder can have up to 16 channels, providing more than 1,600 TV channels through one satellite.
 
 
A signal that is bounced off a GEO satellite takes approximately 0.22 second to travel at the speed of light from Earth to the satellite and back. This delay poses some problems for applications such as voice services and mobile telephony. Therefore, most mobile and voice services usually use LEO
 

Satellites face competition from other media such as fibre optics, cable, and other land-based delivery systems such as microwaves and even power lines. The main advantage of satellites is that they can distribute signals from one point to many locations. As such, satellite technology is ideal for “point-to-multipoint” communications such as broadcasting. Satellite communication does not require massive investments on the ground
 
The Intelsat spans theToday there are approximately 150 communication satellites in orbit with over 100 in geosynchronous orbit.
globe, and domestic satellites such as the USSR's Molniya satellites. Western Union's Westar, and Canada's Anik - serve individual countries. The Intelsat V is the latest in its space-craft series, it can handle 12,000 telephone circuits and two color television transmission simultaneously.
 
 
Which of the following whirls around the Earth at 5 miles per second? Hubble Space Telescope. The Hubble Space Telescope is named after Edwin Hubble (1889-1953). Hubble's Law (also named after Edwin Hubble) is a theory that suggests that there is a constantly expanding universe.
 
 
Weather Satellites

 
 
The first weather satellite was launched on February 17, 1959. What was the name of this satellite? Vanguard 2. Vanguard 2 was designed to measure cloud cover, however, this satellite was poor in collecting data as a poor axis and rotation kept it from collecting meaningful information. TIROS-1 which was launched by NASA in 1960, was the first successful weather satellite and operated for 78 days.
 
THE MOON
 
 

The prevailing hypothesis today is that the Earth–Moon system formed as a result of agiant impact, where a Mars-sized body (named Theia) collided with the newly formed proto-Earth, blasting material into orbit around it that accreted to form the Moon.[20] This hypothesis perhaps best explains the evidence, although not perfectly.
 
The Moon is drifting away from the Earth:The Moon is moving approximately 3.8 cm away from our planet every year. It is estimated that it will continue to do so for around 50 billion years. By the time that happens, the Moon will be taking around 47 days to orbit the Earth instead of the current 27.3 days.
 
Evolution of moon  7 min
http://www.youtube.com/watch?v=TuHasBN-U1c
4 min good video
http://www.youtube.com/watch?v=aSV98i0jzro
 
STRANGE SATELLITES
 
Lapetus moon
 
Iapetu(continued)