Download Grade 9 Academic Science – Space

Grade 9 Academic Science – Space
Night Sky
Section 8.1
Use your textbook to complete the sentences. NOTE: The phrases are not replicated from the textbook.
You may have to think about your answer. As well, words can be used more than one time.
Alien
Astronomy
Galaxy
Gas Giant
Life
Luminosity
Luminous
Milky Way
Moon
Non-luminous
Planet
Satellite
Solar System
Terrestrial Planets
Universe
Wandering Stars
The _______________________ is the totality of existence including planets, stars, galaxies, contents of
intergalactic space, as well as all matter and energy. In other words, it includes everything.
________________________ is the scientific study of matter in outer space, especially the
positions, dimensions, distribution, motion, composition, energy and evolution of celestial bodies.
In other words, ____________________________ is t he branch of science that deals with celestial
objects, space and the physical universe as a whole.
To self-produce and emit light is to be __________________________. In general terms, the
measure of the amount of light produced and emitted must be ________________________. In
space terminology, the measure _________________________ means the total amount of
energy emitted by a star in joules per second (i.e., watts).
A _____________________ is a large, round celestial objects moving in an elliptical orbit around
a star. The Greeks called these objects _____________________________ _____________
because they appeared to move relative to the stars in the night sky.
The Sun and all the objects that orbit around it is called the _______________________
______________. Our ___________________ _______________ has eight planets: Mercury,
Venus, Earth, Mars, Jupiter, Saturn, Neptune and Uranus. The four planets closest to the Sun
are called _________________________ _________________, while the outer four planets,
which consist mostly of gas and liquids, are called ______________________
_________________.
Our ______________ is a ___________________ because it travels around the Earth in a
closed orbit. Our _____________________ is held in this orbit by Earth’s gravitational pull.
The Moon reflects light. It does not produce or emit light. You and I see the Moon because
visible light from the _____________ reflects off its surface. Thus, the moon is
________________________________.
A system of millions or billions of stars, together with gas and dust, held together by gravitational
attraction is called a _______________________. The planet Earth is found in the
__________________ ___________. It contains 200 billion stars….and thus, countless planets,
It has a flat, elliptical shape with many protruding arms or branches.
Given all this information and ideas….including size, composition and age…do you think there is
a possibility of _______________________ consisting of ____________________ somewhere
else in the Universe. Provide three reasons why you would answer Yes or No.