Caleb
The magnitude of a star<br>depends on the star’s _________, _________________, and _____________from Earth.
Size, Temperature, and Distance
___________________ are tens to hundreds of times larger and hundreds of times more luminous than the sun.
Giant stars
True or False. Scientists believe that a nova forms when an existing star suddenly flares up and becomes hundreds or thousands of times cooler than normal.
False
True or False. Astronomy teaches that the positions of the sun, moon, planets, and stars at the moment of a person’s birth determine his destiny.
False
True or False. If an object is moving away from Earth, its colors’ wavelengths become shorter, and the colors shift more toward the red end of the spectrum. This action is called redshiſt.
False
When we look at the stars and say that one is brighter than another, we<br>are talking about how bright each star appears to us. Astronomers call this a star’s _______________ __________________.
Apparent Magnitude
True or False. Astronomers can determine how far away from Earth some stars are by measuring how far stars appear to move compared to even more distant stars.
True
Astronomers believe that a supernova occurs when a massive star has used up its _______________ fuel.
Hydrogen
What early telescopes used special lenses that were able to bend light to create an image though it was still somewhat blurry?
Refracting
What does it mean to be an "open" star cluster?
The stars are arranged in no particular pattern or design.
______________________, a Greek who lived 130 years before the<br>time of Christ, devised the system<br>still used today to classify stars by<br>their brightness.
Hipparchus
The apparent movement or change in position of one star in relationship to other stars is known as ___________________.
Parallax
Astronomers think that when some supergiants collapse, the extreme _____________ in the star’s core crushes the protons and electrons together to form _____________.
Pressure, Neutrons.
____________ telescopes can detect objects that do not give off enough light to be detected by other telescopes.
Radio
A ____________ is a huge star system that contains millions, or even billions, of stars and covers many light-years of space.
Galaxy
Rank the following celestial bodies from HOTTEST to COOLEST:
Betelgeuse, Rigel, Polaris, Aldebaran, the Sun, and Sirius A.
Rigel, Sirius A, Polaris, the Sun, Aldebaran, and Betelgeuse
Stars that regularly or repeatedly change in magnitude are called _____________ stars.
Variable Stars
Astronomers cannot see black holes due to what reason?
The gravitational pull is so strong that it pulls light in and nothing can be seen.
A spectroscope breaks down the light given off by a star into all its ______________.
Colors
What is the difference between a meteor and a meteorite?
A meteor has entered the planet's atmosphere while a meteorite has actually landed on the surface.
_________________ are hundreds of times larger than the sun and thousands of times brighter
Supergiants
A kind of star that does not change its absolute magnitude but does change its apparent magnitude. These stars are called ____________________ stars.
Eclipsing Variable
What constellations are circumpolar and revolve around the NORTH STAR?
Cassiopea, Great and Little Bears, and Draco
What star group contains three or four stars held together by gravitational forces?
Multiple Star group
What is the main problem regarding telescopes on Earth?
The atmosphere is filled with too much dust and debris