Formation of stars and planets

FORMATION OF STARS AND

PLANETS

PLANETS AND STARS A celestial body moving in an elliptical orbit round a star is

known an a planet. A star is a luminous sphere of plasma held together by its

own gravity.

SUN

EARTH MARS STARS

HOW DO PLANETS AND STARS FORM??

The planets in our Solar System are believed to have formed from

the same spinning disc of dust that formed the Sun. This disc, called the solar nebula, was composed mainly of hydrogen

and helium.

NEBULA

Particles in the spinning disc began to clump together as gravity attracted them to each other. Over a few million years many of these chunks had merged together and there were  objects called planetesimals, with diameters of about 1000 m.

PLANETESIMALS

Over time the planetesimals continued to collide and join together, attracted by gravity. These larger objects, about the size and mass of our Moon, are called protoplanets. The accumulation of material to form planets in this way is called accretion.

MOON

ACCRETION PROTOPLANETS

 Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds. These regions are extremely cold.At these temperatures, gases become molecular meaning that atoms bind together.

MOLECULAR CLOUDS

STARS FORMING

STARS

TRUE or FALSE?TRUE or FALSE?The Sun is a star.

How many planets in the solar system have rings?

Four planets.Jupiter, Saturn, Uranus, and Neptune all have rings.

What is the name of our galaxy?

The Milky Way

Who am I? I am the smallest particle of chemical element that can exist.

Atoms.

What are the gases found in a planet?Oxygen,Carbon Dioxide,Nitrogen,Water

Vapour.