Astronomy Flashcards
(21 cards)
What is an orbit?
A curved route, usually elliptical, known as a planet and plenty of others.
What is an astronomical unit?
Unit measurement of 149.6 million kilometers, the distance from the middle of the earth to the middle of the sun.
What is a light year?
Unit of astronomical that is the distance of which light travels in a year.
What is parsec?
Unit of distance in astronomy.
What is nebula?
Cloud of dust and gas in space.
What is a constellation?
A group of stars creating a pattern.
What is planetesimal?
A body, with other bodies will start to come together by gravity to create a planet.
What is protoplanetary?
Rotation of gas and dust that covers the center of a developing solar system.
What is a nuclear fusion?
Nuclear reaction when atomic nuclei of low atomic number fuse to create a heavier nucleus with the release of energy.
What are terrestrial planets?
Planet with a thick rocky surface.
A planet almost completely surrounded by gas is called what?
Gas giant planets
A celestial object made of dust and a nucleus of ice is what?
Comet
A tiny rocky body going around the sun is called what?
Asteroid
A person who studies evolution and space-time situations of the universe is named what?
Cosmologist
The rate of change of angular position of a spinning body is called what?
Angular velocity
An amount of time is called what?
Period
Going in a circular motion on a central axis is called what?
Revolve
Going around in circles on an axis or center is what?
Rotation
The time between two transits of the First Point of Aries is what?
Sidereal day
The time between meridian transits of the sun is what?
Solar day
The total time period of 365 days (366 days in some cases) would be a what?
Year
