Astronomy Flashcards
(21 cards)
Define Constellation
A group of stars that make a pattern.
What is the definition of Astronomical unit?
A unit used to measure astronomic distance in the solar system between the earh and sun.
What is a light year?
The distance light travels in one year.
Define Parsec?
Parsec is a unit of distance equal to that required to cause a heliocentric parallax of second.
What is the definition of Nebula?
Fuzzy patch in the sky, either light or dark.
What is the definition of planetesimal?
A minute planet is a body that can come together with many others under gravitation to form a planet.
What is Protoplanetary?
Rotating dust and gas that surronds the core of a developing planet.
A Nuclear Fusion is…
A Nuclear reaction when two light nuclei join together to make a heavier nuclei.
What is terrestial planets?
The inner solar system planets composed of rocky materials and iron.
Define the gas giant plantes?
A large massive low-density planet that is composed primarily of hydrogen, helium, methane, and ammonia in either their gaseous or liquid state.
A Comet is…
A celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas.
What is an Asteroid?
A small rocky body orbiting the sun.
Define cosmologist.
An astronomer who studies the evolution and space-time relations of the universe.
What is the definition of Angular Velocity.
The rate of change of angular position of a rotating body.
What is an Orbit.
The curved path of a celestial object or spacecraft around a star, planet, or moon.
Define period.
A length or portion of time.
What is a revolve?
Move in a circle on a central axis.
What is a rotation?
The action of rotating around an axis or center.
Whats sidereal day?
The time between two consecutive transits of the First Point of Aries.
Define solar day?
The time between successive meridian transits of the sun at a particular place.
What is a year?
The period of 365 days.
