Astronomy Flashcards
Put in order: Solar system, planet, comet, universe, star, asteroid, moon
Generally: universe, solar system, star, planet, moon, comet, asteroid
What is a universe
A collection of billion of galaxies
What is a galaxy
A collection of million of solar systems
What is a solar system
A collection of planets orbiting a star or two
What is a star
A burning ball of gas undergoing fusion
What is a planet
An object that orbits a star
What is a moon
An object that orbits a planet
What is an asteroid
Lumps of rock in a circular orbit around a star (probably a part of a planet)
What is a comet
A mixture of ice and rock with an elliptical orbit around a star
Everything orbits the … in our solar system because of … force. The sun had the … gravitational force because it has the largest …
sun
gravitational
largest
mass
Polar satellites orbit … in low earth orbits (LEO), radius of their orbits is … (r=6000km) and take about … to orbit the Earth. They … sections of the earth as it rotates beneath it. Eventually the satellite would have scanned …
pole to pole small 100 mins scan the whole earth
Geostationary satellites are much … from the earth (r=42000) and they take … to orbit the earth. They are … and they orbit at the same rate the earth … therefore they APPEAR to be … in the sky from the ground.
further 24 hrs positioned above the equator spins on its axis stationary
Uses for polar orbit satellites
weather, spying, mapping
Uses for geostationary satellites
local weather, communication (tv)
Equation for calculating the speeds of the 2 types of satellite in km/h
v= 2Pir /t
