Astronomy Flashcards
Explain what a light year is?
A light year is how far light travels in a time of one year.
What is equivalent to a parsec?
3.26 light years.
What does this picture show?
This picture shows interstellar clouds with dust and gas, whis is a nebula.
What is the definition of planetesimal?
It is small bodies which formed from the solar nebula, which eventually grew into a protoplanet.
Clumps of material, formed in early stages of solar system formation, which is a forerunner of planers we see today.
Nuclear fusion is when two or more atomic nuclei fuse together to make a heavier one.
They are planets composed mainly of hydrogen, helium and methane.
What is a comet?
A chunk of ice that orbits the sun.
What is a cosmologist?
A cosmologist is someone who studies the origin and dunamics of the universe.
What is the definition of angular velocity?
It is the rate at which a body rotates or revolves.
What is a period?
It is the time it takes for an object to complete one full orbit.
What is the definition for revolve?
It is to move around another object.
Whats the definition for rotation?
Moving around an axis of something.
What is the definition for sidereal?
It is the period of time it takes for a planet to complete one full rotation.
What is the definition of a solar day?
It is the time required for a planet (celestial body) to return the same place relative to the sun.
What is the scientific definition of a year?
It is the period it takes to complete one full revolution around the sun.
What is the definition of accretion?
Growth in size of something such as the water level.
What is Spring Tide?
Spring tide is when the moon is directly across from the sun and it cause the tide accretions to vary greatly.
Neap tide is….
(fill in the blank)
Neap tide is when the moon is at a right angle from the sun, and the tide accretions vary very little.
