astro (11.1- 11.3)🪐 Flashcards
what is the sun core temp and surface temp
huge glowing ball of gas, surface temp of 6000C and core temp of 15 million C
How is the sun’s energy released
what is radiated
Nuclear reactions in the core of the sun
radiates in the Infrared, visible and ultraviolet regions of the em spectrum
what are the gases the sun is made up of
helium and hydrogen
what is the path the earth takes to move around the sun called
an orbit
what is the reason some regions get varying hours of daylight throughout the year
the earth’s axis is tilted by 23.5 degrees
zone A and zone B receive equal amounts of energy per second. why is zone A colder than B
zone A has a larger surface area so the energy is more spread out
how many days does the moon’s orbit take
27.3 days
why do humans see only one side/face of the moon
because the moon takes 27.3 days to turn on its own axis
orbital speed formula
2piR/T
Circumference/time
planets from the sun to outwards
mercury
venus
earth
mars
asteroids
jupiter
saturn
uranus
neptune
pluto
My Very Easy trick: Just Say the Nine Planets
however this acronym misses out on mars and uranus
mars after earth
uranus after saturn
essentially, the two words with t (trick, the) are other planets - mars and uranus
what happens to the planet’s orbit as it goes further away from the sun
planet moves slower in its orbit as distance increases from sun
what happens to the surface temperature of the planet as it goes away from the sun
surface temperature decreases
how long does the earth take to complete one revolution on its axis
24 hrs
what does the solar system contain
1 star
8 planets
dwarf planets and asteroids that revolve around the sun
moons that orbit planets
smaller bodies: comets, natural satellites
which bodies have elliptical orbits
planets (mercury and mars), minor planets and comets
when is the sun at the centre of the orbit
when the orbit is approximately circular
what do the 4 planets closer to the sun have in common
they are all rocky and small
what do the 4 planets farther from the sun have in common
they are gaseous and large
how are orbits formed
due to the suns gravitational pull on the planets/ due to gravity
what does the strength of a planets gravitational field depend on
the planets mass
when does the strength of a planet’s gravitational field decrease
as you get further away from it
why does an object in an elliptical orbit travel faster when closer to the sun
gpe converts to ke
gravitational field strength increases as you go closer to the sun
what contains nearly 99.9% mass of the solar system
the sun
What are the inner planets
aka
Mercury
Venus
Earth
Mars
aka terrestrial planets
