New Deck Flashcards
What is the definition of astronomical unit?
The average distance between the sun and the earth.
What is the definition of light year?
The distance light travels in one year.
What is a parsec?
The distance from earth calculated at a stellar parallax of a second of an arc?
What is a constellation?
A variety of groups of stars that are named, like the big dipper.
What is the definition of planetesimal?
Small bodies of nebula that are combined together to create protoplanets.
What is the definition of protoplanetary?
Large planet embroyos that have gone through internal melting. It goes through the early stages of a planet.
What is a nuclear fusion?
The release of energy cause two nuclei to combine to form a nucleus.
What is the definition of terrestrial planets?
The inner planets of the system, like Mars and Earth.
What is the definition of gas giant planets?
A large planet made almost entirely of gas, like Saturn.
What is the definition of a comet?
A celestial or space object that has a nuclues of ice and dust.
What is an asteroid?
A body of rock that orbits or circles the sun.
What is a cosmologist?
A scientist who studies the evolution,space and time of the universe.
What is angular velocity?
The rate of change of rotating an object or body at a angular position.
What is an orbit?
A space object or space craft that circles or revolves around another space object such as the sun.
What is a period?
The time it takes for an event to occur, such as the journey around the orbit.
What is does revolve mean?
To circle or orbit.
What is a rotation?
One complete turn of a celestial body.
What is a sidereal day?
The time it takes for a complete rotation of earth determined by the stars
What is a solar day?
The time between to successive passage of the sun across the merdian.
What is a year?
The time it take for the earth to orbit the sun.
What is a nebula?
Cloud of dust and gas in space.
