Sci 3p 1st U3 : The Universe and the Solar System

The number of galaxies in the universe is about …..... million galaxies.

• 10000
• 100000
• 20000
• 200000

The building units of the universe are ….........

• planets.
• stars.
• galaxies.
• moons.

Galaxies are formed of groups of …......

• moons.
• constellations.
• stars.
• planets.

Galaxies gather in groups known as ….........

• galaxies clusters.
• solar system.
• ancestral galaxies.
• planets.

….............. are located in the spiral arms of Milky Way galaxy.

• Old stars
• Moons
• Small stars
• Big stars

…........ is the star of our solar system.

• Moon
• Galaxy
• The Earth
• The Sun

The Sun and the surrounding planets revolve around the centre of the …...

• Earth.
• Moon.
• Galaxy.
• Venus.

The solar system consists of the Sun and ….... planets rotate around the Sun.

• nine
• eight
• six
• seven

The solar system is located in one of the ….... arms of the Milky Way galaxy.

• spiral
• cylindrical
• straight
• spherical

The Sun takes about ….... to complete one rotation around the centre of the galaxy.

• 220 thousand years
• 220 million years
• 202 million years
• 202 years