i)

Galaxy is a group of stars.

OR

Galaxy is a system of stars,gases,dust/dark matter held together in the heavens/space.

OR

Galaxy is a collection of billions of stars that show a common gravitational link.

ii)

Relationship between stars and galaxies

Galaxies are held together by gravitational attraction much like a solar system while stars in the solar systems combine to form galaxies

OR

Stars makes up the galaxies

OR

Galaxies are made up of several billions of Stars

iii)

Milky way is the galaxy that contains the solar system and the earth.

OR

Milky way is a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.

i)

Stars are natural heavenly bodies/natural bodies in space that burn to produce heat and light.

OR

Stars are glowing balls of hot gas in space.

ii)

Arrangement in order from the sun to the first four planets in the solar system

1. Mercury
2. Venus
3. Earth
4. Mars

Note: The following is an acronym to remember the nine planets in order

My (Mercury) Very (Venus) Easy (Earth) Method (Mars) Just (Jupiter) Speeds (Saturn) Up (Uranus) Nothing (Neptune)

(i)

Milky Way is the galaxy in which the solar system is located.

OR

Milky Way is the group of planets and stars which the earth belongs to.

(ii)

Uses of artificial satellites

1. For space exploration
2. For communication/broadcasting/telephone call
3. For weather forecasting/collecting information on the weather
4. For scientific research/experimental research/internet
5. For military purposes/spying/espionage
6. To study the universe
7. For map making
8. For navigation/satellite for navigation

(i)

Milky Way is the galaxy in which the solar system is located.

OR

Milky Way is the group of planets and stars which the earth belongs to.

(ii)

Uses of artificial satellites

1. For space exploration
2. For communication/broadcasting/telephone call
3. For weather forecasting/collecting information on the weather
4. For scientific research/experimental research/internet
5. For military purposes/spying/espionage
6. To study the universe
7. For map making
8. For navigation/satellite for navigation

(i)

A satellite is an object that moves around a larger object in space.

OR

A satellite is an artificial body placed in orbit round the earth or another planet.

(ii)

Examples of natural satellites

1. Moon
2. Earth

Note: any named planet is also an example of a natural satellite

(iii)

Uses of artificial satellite

1. For exploring the planets/moons
2. For scientific research/experimental research/internet
3. To study the universe
4. For communications/broadcasting/telephone call
5. For weather forecast/collecting information on the weather
6. Map making
7. Spying
8. For navigation/satellite for navigation
9. Military purposes

i)

Man-made satellite or Artificial satellite is a small object put/launched into space by man to orbit (move around) a planet.

ii)

Examples of natural satellites

1. Moon around the earth
2. Earth around the sun
3. Moon around Mars

iii)

Applications/Uses of man-made/Artificial satellites

1. For exploring the planets/moons
2. For scientific research/experimental research/internet
3. To study the universe
4. For communications/broadcasting/telephone call
5. For weather forecast/collecting information on the weather
6. Map making
7. Spying
8. For navigation/satellite for navigation
9. Military purposes

i)

A satellite is an object which moves around a planet in space

ii)

Uses of satellite

1. For exploring the planets/moons
2. For scientific research/experimental research/internet
3. To study the universe
4. For communications/broadcasting/telephone call
5. For weather forecast/collecting information on the weather
6. Map making
7. Spying
8. For navigation/satellite for navigation
9. Military purposes

(i)

Three coldest planets

1. Uranus
2. Neptune
3. Pluto

(ii)

The planets are cold because they are far away from the sun.

(i)

A galaxy is a collection of stars in the universe

(ii)

Milky way galaxy

(a)

Why the planet and their moons move around the sun but they do not clash

The gravitational force of attraction of the sun on the planets and their moons provides the centripetal force that keeps the planets and their moons moving in their respective orbits around the sun without clashing

(b)

Uses of the sun's energy in everyday life

1. It provides energy for photosynthesis in plants
2. It generates energy for solar panels
3. It is a source of light
4. It helps the skin produce vitamin D as it shines on the skin
5. It is used for drying clothes

i)

Planet is a heavenly body that moves around the sun or star.

ii)

Planets between the sun and the earth

Mercury and Venus