prep 3 , unit 3 , part 3

The scientist who established the nebular theory is

• Fred Hoyle.

• Chamberlain.

• Laplace.

• Moulton.

According to Laplace assumptions, the nebula gradually lost its heat, so

• its size contracted only.

• its revolving speed around itself increased only.

• its size increased and its revolving speed around itself decreased.

• its size contracted and its revolving speed around itself increased.

According to Laplace theory, the gaseous rings which separated from nebula forming the ........... after its cooling and freezing.

• Sun

• planets

• gaseous ball

• universe

.......... theory assumed that the solar system was originally a glowing gaseous sphere.

• Nebular

• Crossing star

• Modern

• Big Bang

The scientist(s) who established the crossing star theory is(are)

• Chamberlain and Moulton.

• Laplace.

• Newton.

• Fred Hoyle.

In the modern theory, bombing the star nucleus away was due to

• the force of gravity.

• drop in temperature.

• collision by asteroids.

• huge nuclear reactions.

.... theory assumed that the origin of the solar system was from the explosion of the expanded part of the Sun forming a gaseous line of a great length from the Sun due to a huge star approached to it.

• Nebular

• Big Bang

• Crossing star

• Modern

The founder of modern theory to explain the origin of the solar system is

• Chamberlain.

• Moulton.

• Fred Hoyle.

• Laplace.

Fred Hoyle assumed that the Sun controls the orbits of planets around it due to the .......... of the Sun.

• heat

• light

• attraction force

• glowing

Astronomers use a special equipment to study the Sun, this equipment is the

• hubble telescope.

• solar telescope.

• microscope.

• light year.