Knowledge Flashcards
7 cards from real ASP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Knowledge flashcards as text
What is the name of the region of the solar system where most short-period comets originate?
Answer: Kuiper Belt
The Kuiper Belt, a disk of icy bodies beyond Neptune's orbit, is the primary source of short-period comets that orbit the Sun in under 200 years.
Which instrument is used to analyze the spectrum of light from a star?
Answer: Spectrograph
A spectrograph disperses starlight into its component wavelengths, allowing astronomers to study composition, temperature, velocity, and other stellar properties.
What does the term 'magnitude' refer to in astronomy?
Answer: The brightness of a celestial object
Magnitude is a logarithmic scale of brightness; lower numbers (and negative values) indicate brighter objects.
What is a planetary nebula?
Answer: The glowing shell of gas expelled by a dying low-mass star
A planetary nebula forms when a low-mass star sheds its outer layers at the end of its life, creating an illuminated shell around the remaining white dwarf.
Which law states that equal areas are swept out in equal times as a planet orbits the Sun?
Answer: Kepler's second law
Kepler's second law (law of equal areas) states that a line joining a planet to the Sun sweeps equal areas in equal intervals of time, implying planets move faster near perihelion.
What is the approximate age of the observable universe?
Answer: 13.8 billion years
Based on CMB measurements and the expansion rate of the universe, cosmologists estimate the universe is approximately 13.8 billion years old.
What type of object results when a very massive star (>25 solar masses) undergoes a supernova explosion?
Answer: Black hole
When the core of a very massive star collapses after a supernova, the resulting object's gravity is so extreme that not even light can escape, forming a black hole.