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Physics
Paper 2
P8- Space Physics
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Created by
Alice Kendrick
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Cards (47)
What is at the center of our solar system?
The Sun
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What does heliocentric mean?
The
Sun
is at the center
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Name two dwarf planets that orbit the
Sun.
Pluto
and
Ceres
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What other celestial bodies are found in our solar system?
Asteroids
and
comets
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How is our solar system positioned within the Milky Way galaxy?
It is a
small
part of the
Milky
Way
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What mnemonic helps remember the order of the planets?
My Very Early Morning Jam Sandwich Usually Nauseates
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What are smaller planets primarily made of?
Rock
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What are larger planets primarily made of?
Gas
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How do all planets orbit the Sun?
On the
same
plane
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Do all planets rotate at the same speed?
No, they rotate at different
speeds
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What can cause a planet to rotate in the opposite direction?
Past
collisions affecting its
axis
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Why do larger planets have rings?
Their strong
gravitational field
attracts
debris
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What was the initial model of the solar system?
The
geocentric
model
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What did the geocentric model propose?
Everything orbited the
Earth
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What was a key feature of the geocentric model?
Perfect circular
orbits
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What evidence supported the heliocentric model?
Mars' retrograde motion
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Why does Mars appear to reverse its direction in the sky?
Earth
overtakes Mars in its
orbit
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What did Galileo observe that challenged the geocentric model?
Moons
orbiting Jupiter
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What did Kepler discover about planetary orbits?
They orbit in
ellipses
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What causes a planet to change direction as it orbits the Sun?
The
gravitational force
from the Sun
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How does the velocity of a planet change as it orbits?
It
is
always
changing
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What happens to a planet's speed due to gravitational force?
It
accelerates
without increasing speed
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What conditions lead to a stable orbit?
Closer
proximity
to the Sun increases
gravitational attraction
Increased force leads to increased
acceleration
Orbital speed
of the planet increases
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What is the initial state of a star's life cycle?
A
dust and gas cloud
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What draws gas and dust particles together in a galaxy?
Gravitational attraction
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What happens to the cloud of gas and dust as particles get closer?
It becomes more
concentrated
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What increases as the particles in the cloud are pushed together?
Temperature
and
pressure
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What occurs when pressure in the cloud becomes great enough?
Fusion
of gas/dust particles occurs
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What is produced when hydrogen nuclei fuse together?
Helium nuclei
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What happens when a star runs out of gas to fuse?
It
collapses
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What is the result of fusion in a star?
A large amount of
energy
is created
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What balances the gravitational collapse of a star?
The energy released from
fusion
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What occurs if a massive star collapses?
It produces a
supernova
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What remains after a massive star's supernova?
A
neutron star
or
black hole
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What happens to a normal-sized star after it collapses?
It produces a
planetary nebula
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What remains after a normal-sized star's collapse?
A
white dwarf
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What does red shift indicate about galaxies?
They are moving away from
Earth
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What does the change in distance of galaxies' speed indicate?
Evidence of an
expanding universe
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How can the expansion of the universe be visualized?
As an expanding balloon with
galaxies
on it
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What happens to the wavelength of light from a galaxy moving away?
It becomes
red-shifted
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