Lenses often cause this type of optical distortion that results when different wavelengths of light are refracted (bent) by different amounts.
What is chromatic aberration?
100
The celestial sphere is divided into this number of constellations.
What is 88?
100
The brightness of stars is often quantified using this measurement that has it's origins with the ancient Greek astronomer, Hipparchus.
What is apparent visual magnitude?
100
This subatomic particle has a negative charge.
What is an electron?
100
The region of the sun from which most of it's light is emitted is known as this.
What is the photosphere?
200
This type of telescope uses a curved mirror as it's objective.
What is a reflector?
200
Constellations are often identified by the familiar shapes they contain, generally referred to as this term.
What are asterisms?
200
Young, hot, blue stars can often be found in groups known as these.
What are open clusters?
200
When an electron drops from a higher energy level to a lower one, this particle is emitted.
What is a photon?
200
During a solar eclipse, this portion of the sun becomes visible on Earth.
What is the corona?
300
The resolving power of a telescope primary determined by this property of the instrument.
What is the diameter of the objective?
300
Constellations that never rise or set are sometimes called this rotational term.
What is circumpolar?
300
The color of a star can be used to determine this important feature of the star's surface.
What is temperature?
300
The atoms in a cool gas can be identified using this type of spectrum.
What is an absorption spectrum?
300
The sun produces light by fusing hydrogen into this element.
What is helium?
400
The magnification of a telescope can be determined by finding the ratio of these two numbers.
What is focal length of the objective to the focal length of the eyepiece?
400
This star's name is the bull's eye in Taurus.
What is Aldeberan?
400
Rapidly rotating neutron stars that emit periodic signals are called these.
What are pulsars?
400
Ionized gases or plasma produce a bright-line or this type of spectrum.
What is an emission spectrum?
400
Sun spots are regions of the Sun's surface where these exit and return.
What are magnetic fields?
500
Radio telescopes are often connected together to do this type of computer-assisted observing.
What is interferometry?
500
This constellation is often thought of as the lost zodiac sign because only a small portion of it crosses the ecliptic where a foot is stomping the scorpion.
What is Ophiucus?
500
This is the name of the event when a star's core collapses and explodes.
What is a supernova?
500
Excited hydrogen gas produces a series of visible bright lines known as this series.
What is the Balmer Series?
500
When the sun releases a large amount of it's mass in a single burst, engineers on Earth work to protect against this event abbreviated as a CME.