The solar system Flashcards
(34 cards)
how many planets are there
eighth
what are all the planets
Mercury
venus
earth
mars
Jupiter
Saturn
Uranus
Neptune
what were the 2 ideas about the solar system
geocentric
heliocentric
what was the geocentric model
stated that the earth was in the centre of the that that the moon and sun orbited around the earth
what is the heliocentric model
that the sun is in the centre of the solar system and all the planets orbit around it
what 5 things make the solar system
sun
planets
asteroids
comets
dwarf planets
what are the 2 types of satellites
natural and artificial
what are 2 examples of natural satellites
planets
mood
what is a natural satellite
a satellite that is formed by natural processes
what is an artificial satellite
manufactured on Earth and launched into orbit and space by rockets
what are the 2 types of artificial satellites around earth
geostationary
low polar orbits
what is a geostationary orbit satellite and what is its purpose
orbit around the equator of the earth and are used for GPS
what is a low polar orbit satellite and what is its purpose
orbit close to the earth and are used for weather mentoring and spying
why do comets have highly elliptical orbits
as they get closer to the sun the gravitational forces increase and weaken as you move away. this causes the comet to travel slower when far away from sun and faster when it is closer to it
which planet has a higher orbital speed earth or Jupiter
earth
what are the 2 theories about the universe
Big bang theory
Steady State
what is the Big Bang theory
says that the whole universe started as a tiny particle that expanded from this point in space. and the universe is still expanding today
what is the steady state theory
says that the universe has always existed and is expanding and new matter is being created as it expands
what are 2 differences between steady state and Big Bang Theory
- big Bang says that the universe had a start while Steady State says that the universe has always existed
- in the Big Bang theory no new matter is created while the steady-state says that as the universe expands new matter is created
what is a similarity between steady state and Big Bang Theory
both say that the universe is expanding
what is evidence that the universe is expanding
red-shift
what is evidence of big band theory
CMB
what is Red-shift
when objects emit light such as galaxies are moving away from us then the light they emit is red-shifted. this is because the wavelengths detected on Earth will be stretched and will be turned towards the red end of the spectrum (longer wavelengths) as the object is moving away from us
what does CMB stand for
Cosmic Microwave Background