Astrology Flashcards
What does astronomical unit mean?
A unit of length equal to the mean distance from the Earth to th Sun or the Sun to the Earth.
What is a light year?
The distance that light traveled in one solar year.
What is the cause of a parsec?
A unit of distance required to cause a heliocentricparallax.
What is a nebula?
A cloud made up of intersteller gas and dust.
What is a constellation?
The position of the stars that influence various events.
What does planetesimal form?
One of the smallest celestial bodies that were fused together to form the planets of our solar system.
What is protoplanetary?
It is the proccess in wich matter goes through condensation to form a planet.
What does nuclear fusion mean?
A thermoonuclear reaction where nuclei of light atoms join to form nuclei of heavier atoms.
What are the four terrestrial planets?
Any of the 4 planets close to the sun: Mercury,Venus,Earth,and Mars.
What are gas giant planets?
Planets mostly made up of gases sorrounding a rocky core.
What is a comet?
A celestial body moving aroud the sun.
What is an asteroid?
Small bodies of planets from 480 miles to less than one mile.
What do cosmologist study?
People that study the general structure and evolution of the universe.
What is Angular velocity?
The time of change of angular position of a body of rocks.
What is an orbit?
The curved path of something around the celestial body of the sun or a planet.
What does period mean?
A round of time or series in wich time is measured.
Wich way does the earth revolve?
The Earth rotates counter clockwise around the sun. The rotation a planet around the sun.
What is the rotaion of the moon?
Counter clockwise faster than the Earth.The act of something rotating.
What is a sidereal day?
A day 4 minutes shorter than the mean of a solar day.
What is a solar day?
The period of time from sunrise to sunset on our planet.
What is a year?
A time period of 365 or 366 days in 12 months.
What is Accretion?
It is an increase by natural growth in size or extend.
What is a spring tide?
The highest rise and fall at or after a full or new moon.
What is a Neap tide?
A neap tide is when the tides are at there lowest altitude.Or their difference is low.
