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Grade 9 Academic Science – Unit 3 Space – What I already know
Stars
Planets
Deep Space
Earth and Moon
Other Stuff
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1.5 X 108 km
What is:
The distance from Earth
to our Sun?
This distance is called an
Astronomical Unit. This is the
unit of measurement used
inside our Solar System
Eight minutes
What is:
The time it takes light to
travel from the Sun through
space to reach Earth?
A massive collection of gases
held together by the force of
its own gravity and emitting
large amounts of energy.
What is a star?
VY Canis Major is the largest
known star. It is about 2000X
larger than our Sun
Betalgeuse, in the Orion
constellation, is 1180X larger
than our Sun
The well-defined surface
areas on the Sun that appear
darker than their
surroundings because of
lower temperatures
What are Sun Spots?
It is the star nearest
to Earth
What is the Sun?
The Romans named this
planet after the God of
Battle.
What is Mars?
The density of this planet is
so low that it would float if
you put the planet in a giant
glass of water
What is Saturn?
Saturn’s density is 0.687 g/cm3
while the density of water is
3
0.998 g/cm
It is the hottest planet
What is Venus?
While Venus is the second
planet from the Sun, its
atmosphere traps solar energy
and makes the surface
temperature 465OC
It was the first planet
discovered with the aid of a
telescope
What is Uranus?
The “closer” planets can be
seen without a telescope.
Composed of mostly gas,
Uranus is blue-green
because red wavelengths
are absorbed by Uranus’
thick methane clouds
It was destroyed by Saturn’s
gravity, and now, its
remnants make up the rings
around Saturn
What is:
A Moon that once orbited
Saturn?
These form when a star
implodes (i.e., collapse in on
itself) at the end of its lifetime,
and once formed, its
gravitational pull is so large
that light is not emitted
What are Black Holes?
50 billion
What is:
The number of galaxies
in the Universe?
The theory of the start of the
Universe
What is the Big Bang?
Over four Light-Years
away, this star is closest to
our Milky Way
What is
Alpha Centauri?
It is where stars are “born”
What is a Nebula?
Almost 75% of the Earth’s
surface is covered by this
compound.
What is water?
Our Moon formed when an
object the size of Mars struck
this planet and a large section
of the planet broke away
What is Earth?
A meteor becomes a
meteorite when it impacts
this celestial body.
What is the Earth?
These are produced on Earth
by the gravitational pull
of the Moon
What are Tides?
This eclipse occurs
when the Earth
crosses in front of the
Sun and the Moon
“disappears”
What is
a Lunar Eclipse?
The name of our galaxy
What is
the Milky Way?
300,000 km/s
What is
the Speed of Light?
The astronomer who
discovered the
Universe is expanding.
Who is
Edwin Hubble?
Kepler’s First Law: This is
the trajectory of a planet
What is an Ellipse?
It is not the shape of an egg;
rather, it is like a stretched
balloon with two axes of
symmetry: a major axis and a
minor axis
It is NOT a
measure of time;
rather,
it is a measure of
distance
What is a Light Year?
A Light Year is the distance
that light travels in a vacuum
(i.e., empty space) in one
year…about 9.46 X 1012 km.