Science 1 :10.space mission

• The astronomical object closest to us is ................. in our galaxy.

  Moon
• The functioning of the satellite launch vehicle is based on ....................... .

  Newton's third law of motion
• ........... is a satellite launch vehicle.

  PSLV
• The height of a medium earth orbit above the surface of the earth is ............ .

  25000 km
• The minimum velocity of the spacecraft to escape from the earth's gravitational force must be ............ .

  11.2 km/s
• INSAT ,GSAT ,IRS ,PSLV

  PSLV. (It is a satellite launch vehicle. Others are satellites.)
• (1) Hubble telescope : 569km high from the earth's surface : : Revolving orbit of Hubble telescope : ________.

  Low Earth Orbit
• INSAT : Weather satellite : : IRS : _____.

  Earth observation satellite
• IRNSS : Direction showing satellite : : INSAT : ______.

  Weather satellite
• If a spacecraft has to be sent away from the influence of the earth's gravitational field ,it's velocity must be less than the escape velocity.


  False.

  The escape velocity of a body is the minimum velocity with which it should be projected from the earth's surface, so that I can escape the influence of the earth's gravitational field.
• Name the first artificial satellite sent by Russia in space

  Sputnik
• Geostationary satellites are not useful for studies of polar regions.

  OR

  Why are Geostationary satellites not useful for studies of polar region?


  (1) A geostationary satellite revolves in the equatorial plane of the earth. It revolvs in the same sense as the rotation of the earth and its period of revolution equals the period of rotation of the earth .It is stationary as observed from the earth.

  (2) It does not fly above the plar regions. Hence ,geostationary satellites are not useful for studies of polar regions
• What is meant by space debris?

  In space, nonessential objects such as the parts of launchers and satellites, revolving around the earth are called space debris.
• What is an artificial satellite?


  A man made object that revolves around the earth or any other planet in a fixed orbit is called an artificial satellite.
• Function of Weather satellite

  It is used for the study and prediction of weather.
• Function of communication satellite.

  It is used for establishing communication between different locations in the world by using specific electromagnetic waves.
• Function of Broadcast satellite

  It is used for telecasting television programmers.
• Function of navigational satellite

  It is used to fix the location of any place on the earth in terms of the latitude and longitude of the place
• Function of military satellite

  It is used to collect information for security aspects In order to protect the country
• Function of Earth observation satellite

  It is used for the study of forests, deserts, oceans, polar ice on the earth's surface, exploration and management of natural sources, observation and guidance in the event of natural calamities like flood, earthquake and storm.
• Orbits of artificial satellites can be classified based on:

  • The angle of the orbital plane: it can be the equatorial plane of the earth or at an angle to it
  • The nature of the orbit: it can be circular or elliptical in shape
  • The height of the satellite from the earth's surface
• A satellite orbiting at a height equal to or greater than 35780 km above the earth's surface is called a High Earth Orbit satellite
• A satellite orbiting at a height between 2000 km and 35780 km above the earth's surface is called a Medium Earth Orbit satellite
• A satellite orbiting at a height between 180 km and 2000 km above the earth's surface is called a Low Earth Orbit satellite