Earth And Space

Question 1

Galaxies

Answer 1

a huge collection of gas, dust, and billions of stars and their solar systems

Question 2

Solar system

Answer 2

the collection of eight planets and their moons in orbit round the sun

Question 3

Astronomer

Answer 3

a scientist who studies the stars, planets, and other natural objects in space.

Question 4

Expanding univers

Answer 4

That it has been growing ever since its beginning with the Big Bang

Question 5

Singularity

Answer 5

a point at which a function takes an infinite value, especially in space–time when matter is infinitely dense, such as at the centre of a black hole.

Question 6

Gravity

Answer 6

the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.

Question 7

Star

Answer 7

.
a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.

Question 8

Planet

Answer 8

a celestial body moving in an elliptical orbit round a star

Question 9

Cosmology

Answer 9

an account or theory of the origin of the universe

Question 10

Celestial body

Question 11

Moon

Answer 11

a natural satellite of any planet.

Question 12

Asteroid

Answer 12

1.
a small rocky body orbiting the sun. Large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter, though some have more eccentric orbits.

Question 13

Comet

Answer 13

a celestial object consisting of a nucleus of ice and dust and, when near the sun, a ‘tail’ of gas and dust particles pointing away from the sun