Download Stars and Black Holes: Stars A star is a massive, luminous ball of

Stars and Black Holes:
Stars
A star is a massive, luminous ball of ____________. A star shines because nuclear
fusion in its core releases energy that radiates into space. Although in the sky, stars all
appear _____________ they are actually all different colours.
The ______________ of a star depends on the amount of energy it is giving off.
______________ have the most energy and are the hottest ____________ are have the
least energy and are coolest.
Nebulae
A nebula is a large cloud of ______________. Nebulae are often called
______________ because stars develop from gas and dust.
A nebula is formed when a ______________ or “old star” explodes. This explosion
provides the matter for the nebula.
How a Star is Born
A region of nebula _____________ in on itself and gravity pulls dust
and gas together.
As a mass grows, it _________, ___________,
______________, and heats more. This results in a
______________.
Stars are classified by their size:
Low mass stars
Medium mass stars (e.g. ____________)
High mass stars
Each has a different ______________.
Galaxies
There are _____________ of galaxies in the ______________.
Galaxies are ________________: they contain ________, ___________, and _______.
The farthest galaxies and the stars we see shining in them may be also the
_____________ because it takes the _____________ so long to reach us.
Our galaxy is called “The Milky Way”
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Black Holes
A black hole is a region in space where gravity is so strong that nothing
(_____________) can escape.
Astronomers believe each galaxy in the universe contains at least one supermassive black
hole. Astronomers can detect black holes by the presence of rapidly _______________
moving around an ________________. This point is a black hole.
The gravity of a black hole is so strong that is can pull a star into it. When massive stars
_______________ in a _______________ they form a black hole afterward.
Star Charts
Star charts are _________ that show some of the main ________________ in the sky.
Star gazers use these star charts to orient themselves to the night sky, just like people use
a map on the ground.
They show people where to look in the sky to see a constellation.
SEE PAGE 551 IN TEXT
Homework = Read pp. 294-299 P. 305 #1, 2, 5, 11