Astronomy - Sp7 Flashcards
What different bodies are part of the solar system
stars, planets, moons
Order of the planets?
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
When was Ptolemy’s Model introduced?
150 CE
What was Ptolemy’s model about?
he put forth a geocentric model (meaning the solar system revolved around the earth)
planets move in circles
When was Copernicus’ model introduced?
1543
What was Copernicus’ model about?
heliocentric model (sun at centre)
everything orbits around sun as it is largest
When was the telescope invented
1608
Who was the telescope invented by?
Galileo
What did Galileo discover?
4 of Jupiter’s moon
- motioning their movements he deciphered that not everything orbits around earth (smaller objects go around larger objects)
Additional cosmic bodies?
Uranus + Neptune discovered
dwarf planet Pluto discovered 1940s (demoted 2014)
asteroids (mostly found between mars + Jupiter)
comets (made of ice)
What are satellites ?
a body that orbits the earth or another cosmic body
what is an example of a natural satellite?
moons
what is an example of artificial satellites?
GPS satellite, Sky TV satellites, international space station
What is in the current solar system model
8 planets
5 dwarf planets
1000’s comets
millions of asteroids
What is the direction of movement of planets around the sun?
elliptical movement
