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BIOLOGY &
GEOLOGY
Unit 5: THE SOLAR SYSTEM
ACTIVITIES
1. Match the words with their definitions.
1. The Universe
a. is a ball of very hot gas which produces energy
2. A galaxy
b. is composed of galaxies, stars, planets and nebulae
3. The Milky Way
c. is a large group of stars
4. A nebula
d. is the galaxy we live in
5. A star
e. is made of clouds of gas and dust
2. Unscramble the name of each numbered object below. Write the name on the correct line
below.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
3. Check (X) the correct sentences:
is the only star in our Solar System.
is a planet in our Solar System.
gives heat and light to our Solar System.
orbits around the Earth.
1st ESO
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BIOLOGY &
GEOLOGY
Unit 5: THE SOLAR SYSTEM
4. Unscramble the words in brackets. Copy and complete the sentences in your exercise book.
a) A __________ is a natural object, such as the Moon, that moves around a
___________. (atlleseit) (leatpn)
b) An __________ is a small rocky body orbiting the Sun. (teraidso)
c) Halley’s Comet is a _________________ comet because its ____________ period
lasts less than 200 years. (orsth epidro) (aoitrbl)
d) Hale-Bopp. A long period __________, has an orbital period of 4000 years and
originated in the (ecmto) (otOr oldCu)
e) Our _________________ consists of the eight planets and their moons in orbit
around the Sun, plus smaller bodies such as _________ and asteroids. (aolrs stesmy)
(mtseco)
f) Except for Pluto, the ______________ of all planets around the Sun is more or less
on the same ___________. (obrit) (epanl)
5. Match the terms in each column.
a) star
b) planet
c) comet
d) satellite
e) dwarf planet
f) Kuiper belt
g) Oort Cloud
1. Long period comets
2. Short period comets
3. Pluto
4. Sun
5. Halley’s
6. Mercury
7. Moon
6. Look for information on your book and answer the following questions.
a. How old is the Solar System? __________________________________________
b. The sun is a star. What does the Sun give us? _____________________________
c. How many planets make up the Solar System? _____________________________
d. Write the names of the inner planets of the Solar System in red and the names of the
outer planets in blue.
________________________________________________________________
________________________________________________________________
e. What type of planet is Pluto? _________________________________________
1st ESO
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