Astronomy Cards Flashcards
What is the definition of Astronomical Unit?
Unit of length, distance between the Sun and the Earth.
What is the definition of Light Year?
Distance light travels in one year.
What is the definition of Parsec?
Unit of distance that equals to 3.26 light years.
What is the definition of Nebula?
Cloud of gas and dust cast off from stars that used to live in that region of galaxy.
What is the definition of Constellation?
Group of stars that make a recognizable shape.
What is the definition of Planetesimal?
An object that was thought to have existed in the early stages of the solar system.
What is the definition of Protoplanetary?
Large embryos within protoplanetary disks that has went through an internal melting.
What is the definition of Nuclear Fusion?
Reaction in which atomic nuclei of low atomic number combine to form a heavier nucleus with release of energy.
What is the definition of Terrestrial Planet?
Type of planet that has a rocky surface.
What are gas giant planets?
Type of planet that is made of mostly gas and are large.
What are Comets?
A comet consists of ice and dust as a nucleus.
What are Asteroids?
Asteroids are a small rocky body orbiting the sun.
Who are Cosmologists and what do they do?
Cosmologists are Astronomers that study the Universe, it’s physical laws, and everything else about it.
What is an Angular Velocity?
Rate of change in which a body rotates.
What does it mean to orbit?
To revolve around something.
What does it mean to revolve?
To make a circular orbit around something.
What is a rotation?
To rotate around an axis or center.
What is a Sidereal Day?
Time between two constant transits of the First Point of Aries.
What is a Solar Day?
Time between successive meridian transits of the sun at a certain place.
