Y10 Astrophysics Part 1

Which of the following statements is true about our solar system?

• There are 9 planets in the solar system.

• The inner planets are Mercury, Venus, Earth and Mars

• The outer planets are Jupiter, Saturn, Neptune and Pluto.

• The Pluto and comets are considered dwarf planets.

What do you mean by a light year?

• The distance travelled by light in one second.

• The distance travelled by light in one hour.

• The distance travelled by light in one day.

• The distance travelled by light in one year.

Which of the following is the nearest star to us after the sun?

• Alpha Centauri

• Beta Centauri

• Proxima Centauri

• Sirius

These are groupings of large numbers of stars that attract each other gravitationally and are relatively close to one another.

• stellar clusters

• globular clusters

• open clusters

• galaxy

Which is NOT true about a galaxy

• is made up very large numbers of stars and stellar clusters

• it has a few of planets

• can be spiral, elliptical or irregular in shape

• a huge assembly of stars that are kept together by gravity

How far is Proxima Centauri from the Sun?

• 3.0 light years

• 4.2 light years

• 4.3 light years

• 5.0 light years

A cluster is called a

• group of galaxies

• group of stars

• group of planets

• group of asteroids

Andromeda is a spiral galaxy that is expected to collide with Milky Way in

• 3 billions years

• 4 billion years

• 8 billion years

• 10 billion years

This is two stars orbiting a common centre.

• solar system

• binary star

• black hole

• constellation

An small body made up of ice and dust that orbits the sun in an elliptical orbit.

• planet

• meteor

• asteroid

• comet