What is convection, and in which states of matter does it occur?
Answer: Convection is the transfer of heat by the movement of fluid (liquid or gas) particles.
Explain conduction.
Answer: Conduction is the transfer of thermal energy through a material without the movement of the material itself, primarily occurring in solids via particle
What is the difference between a comet and an asteroid?
Comet: Ice and dust, elliptical orbits. Asteroid: Rocky, irregular shapes.
What is the Big Bang Theory?
The theory that the universe began from a hot, dense singularity.
Why does a black surface heat up faster in sunlight than a white surface?
Black surfaces absorb more thermal radiation, while white surfaces reflect most of it.
How are elements heavier than iron formed?
They are formed during supernova explosions through rapid neutron capture (r-process).
What is a supernova?
A supernova is the explosive death of a massive star, releasing huge amounts of energy and elements into space.
What is the main difference between a star and a planet?
Stars emit light; planets reflect light.
What is thermal radiation?
Answer: Thermal radiation is the transfer of energy as electromagnetic waves, primarily infrared, and does not require a medium.
What is the life cycle of a star similar in mass to the Sun?
Nebula → Protostar → Main sequence star → Red giant → Planetary nebula → White dwarf.
Which surfaces are the best emitters and absorbers of thermal radiation?
Dark, matte surfaces are the best emitters and absorbers of thermal radiation, while shiny, reflective surfaces are the worst.
What is the primary source of energy in the Sun?
Nuclear fusion.
Why are metals good conductors of heat?
Answer: Metals have free electrons that move easily through the material, transferring energy quickly between particles.
Name the closest star to Earth.
The Sun.
What is the Milky Way?
The galaxy containing our solar system.
What is a light year?
The distance light travels in one year.
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