astronomy (SP7)

Created by

eden !!

Cards (70)

what orbits our Sun?
planets, dwarf planets, moons, artificial satellites, asteroids, comets
what is the order of the planets in the solar system?
mercury, venus, earth, mars, jupiter, saturn, uranus, neptune
what is the orbit of a comet like?
very elliptical
what is the orbit of a moon like?
slightly elliptical
what is the orbit of a planet like?
elliptical
what is the orbit of a dwarf planet like?
elliptical
what part of the EM spectrum has the longest wavelength?
radio waves
what part of the EM spectrum has the shortest wavelength?
gamma rays
what part of the EM spectrum has the lowest frequency?
radio waves
what part of the EM spectrum has the highest frequency?
gamma rays
what is the EM spectrum order from lowest to highest frequency?
radio waves, microwaves, infared, visible light, ultraviolet, xrays, gamma rays
what is the equation for weight?
weight = mass x gravitational field strength
what direction does centripetal force act in?
acts towards the centre of the circle (inwards)
what is happening to an object in a circular orbit?
travelling at a constant speed and is constantly accelerating
what does gravitational field strength depend on?
the mass of the body creating the field, the larger the mass of the body, the stronger its gravitational field. Also on distance, the closer you get to a star or a planet, the stronger its gravitational force
the stronger the gravitational field strength, the larger the what?
instantaneous velocity needed to balance it
for an object in stable orbit, what happens if the speed of the object changes?
the size (radius) of its orbit must do so too. Faster moving objects will move in a stable orbit with a smaller radius than slower moving ones
what was the first model of our solar system?
geocentric model, sun orbits around earth
who came up with the first model of our solar system?
geocentric model, Ptolemy
how was the "geocentric model" observed?
observed the stars by eye
what was the secod model of our solar system?
heliocentric model, earth orbits around the sun
who came up with the second model of our solar system?
heliocentric, Copernicus
how did Copernicus come up with the heliocentric model?
observed data that fitted a heliocentric model
how did Galileo prove a heliocentric model?
Observations of the phases of Venus and the moons of Jupiter with a telescope
who supported Copernicus' idea of the heliocentric model by observing Jupiter's moons?
Galileo
who came up with the idea of elliptical instead of circular orbits?
Kepler
what did Kepler come up with?
the idea of elliptical orbits instead of circular
how is the universe observed today?
telescopes on artificial satellites
what are the disadvantages of using telescopes on artificial satellites to observe the universe?
Clouds and dust can intefere with images and some parts of the EM spectrum are absorbed by the atmosphere
how many moons are in our solar system?
More than 200
which of the EM spectrum's light are blocked by the supper atmosphere?
gamma rays, xrays, ultraviolet
which part of the EM spectrum is obsevable from Earth?
visible light, with some atmospheric distortion
which part of the EM spectrum is mostly absorbed by atmospheric gases best observed from space?
infared
are radio waves observale from Earth?
yes
when was The Steady State Theory?
1948
what is the Steady State Theory?
the universe is expanding, the universe has always existed and new matter is continuously created
when was The Big Bang Theory?
1930s
what is The Big Bang Theory?
the universe is expanding and the universe started out as a tiny point of concentrated energy
how does The Big Bang Theory believe that stars were created?
as the universe expanded, gravity caused matter to clump together to form stars
how old does The Big Bang Theory think the universe is?
13.8 billion years