Energy that can travel through space in the form of waves is....
A. a wavelength
B. electromagnetic radiation
C. visible light
D. convex lens
electromagnetic radiation
100
What do astronomers use to measure distances to nearby stars?
A. light-year
B. universe
C. scientific notation
D. parallax
parallax
100
A star is born when the contracting gas and dust from a nebula become so dense and hot that nuclear fusion starts. How long a star lives depends on....
its mass
100
A star system is made up of how many stars?
2 or more
100
Which theory defines the universe as being formed in an instant, billions of years ago, due to an enormous explosion?
the big bang theory
200
The spectrum of visible light can be seen when white light shines through a prism and the light spreads out to make a range of different colors with different wavelengths. What colors can you see?
red, orange, yellow, green, blue and violet
200
What do scientists use to describe sizes and distances in the universe?
scientific notation
200
Why do stars with less mass last longer than stars with more mass?
Small-mass stars use up their fuel more slowly than large-mass stars, so they have much longer lives.
200
What are star systems that have two stars that are called double stars?
binary stars
200
Because of the big bang theory, will the universe likely expand or shrink as time goes on?
expand
300
What is a special telescope that uses lenses or mirrors to collect and focus visible light?
optical telescope
300
What uses powers of ten to write very large or very small numbers in shorter form, where each number is written as the product of a number between 1 and 10 and a power of 10.
Scientific Notation
300
After a star runs out of fuel, it becomes a ________, a neutron star, or a black hole.
white dwarf
300
In what two ways can we tell if a star is a binary star?
They wobble and an eclipsing binary happens in which one star is dimmer for a short period of time
300
Matter that can not be seen directly and does not give off electromagnetic radiation is...
dark matter
400
Which telescope uses a convex lense, which is a piece of glass that is curved so the middle is thicker than the edges, to gather and focus light?
A. reflecting telescope
B. optical telescope
C. refracting telescope
D. radio telescope
refracting telescope
400
How are stars classified?
color and temperature, size, chemical composition, brightness of stars
400
How does a star form from a nebula?
In the densest part of a nebula, gravity pulls gas and dust together. A contracting cloud of gas and dust with enough mass to form a star called a protostar.
400
Most galaxies are classified into which types?
spiral, elliptical, irregular
400
What states that the farther away a galaxy is, the faster it is moving away from us?
Hubble's law
500
List the electromagnetic waves from longest to shortest wavelength.
gamma rays
ultraviolet radiation
visible light
X-rays
infrared radiation
radio waves
The Hertzsprung-Russell diagram (HR diagram) is used by astronomers to....
classify stars and to understand how stars change over time
500
What special event was an explosion of a giant star 4,000 light-years away, that would have wiped out all life within about 50 light-years away from it?
Supernova of 1054
500
Star clusters consist of many stars that are formed from the same nebula at about the same time and are about the same distance from Earth. What are the two major types of star clusters?
open clusters and globular clusters
500
How was cosmic background radiation discovered?
By accident, two American physicists deteced faint radiation on their radio telescope coming from all directions in 1965, and scientists later concluded that this was the leftover thermal energy from the big bang.