Astronomy Vocab Flashcards
(5 cards)
1
Q
Aphelion
A
the point in the orbit of a planet, comet, or artificial satellite that is farthest from the sun.
2
Q
Approximately what day of the year is the Earth at aphelion?
A
July 3rd
3
Q
What is the reaction that occurs between an elementary particle and its antiparticle? (ex. electrons and positrons)
A
Annihilation
4
Q
Eclipsing Binary
A
A binary star where every orbital period one or both of the solar bodies are obscured by the other, resulting in what looks like blinking light.
5
Q
Alpha Particle
A
The nucleus of a helium atom; a positively charged particle consisting of two protons and two neutrons.
