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Terms in this set (16)

The electromagnetic spectrum consist of...
all of the different types of electromagnetic waves.
All of the following are parts of the range of the electromagnetic spectrum EXCEPT...
sound waves.
Both reflecting and refracting telescopes are designed to...
gather and focus light.
What statement describes an advantage of using radio telescopes instead of optical telescopes to study properties of objects in space?
Radio waves can travel dust and clouds without being distorted.
Which characteristics could a scientist observe with an optical telescope?
Shape of different-sized crater on the moon.
Parallax is used to determine a star's...
distance from Earth.
What is parallax?
The apparent change in position of a nearby star when looked at from different places.
What is a light-year?
The distance light travels in one year.
How are light-years used to measure distances and sizes in the universe?
They provide smaller numbers to work with when measuring distances and sizes in the universe.
A light-year is a unit used to express...
distance.
Which correctly orders the following items from smallest to largest in size?
Star, star cluster, galaxy, universe.
What color are the coolest stars?
red
What is defined as the distance between wave crests?
Wavelength
A scientist is planning an investigation to determine the chemical composition of a distant star. What strategy should she use?
Optical telescope to observe the color of the star, x-ray telescope to observe the x-rays emitted by the star, and a spectrograph to observe the spectrum of visible light from the star.
Stars are classified according to...
brightness, color, composition, size, and temperature.
The spectrum of visible light from a star has a pattern of dark lines. What characteristic about the star can a scientist determine by analyzing this pattern?
Composition.
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