2. WHEN WERE THE PLANETS BORN?
• 4600 million years ago the planets were born. The
sun was formed at the same time. As the sun
became a glowing ball a dics of matter formed
around it. Bits of matter in the dics began to collide
and formed bigger lumps . The lumps grew bigger
and bigger until they became planets.
3. WHY DO STARS SHINE?
• A star is made from two gases. They are called
hydrogen and helium. At the centre of the star,
the force of gravity is so great that it pushes
hydrogen atoms together to form helium atoms.
As this change takes place, large amounts of
energy are released. They pass through the star
and escape from its surface as light and heat.
Editor's Notes
4600 million years ago the planets were born. The sun was formed at the same time. As the sun became a glowing ball a dics of matter formed around it. Bits of mater in the dics began to collide and formed bigger lumps . The lumps grew bigger and bigger until they became planets.
A star is made from two gases. They are called hydrogen and helium. At the centre of the star, the force of gravity is so great that it pushes hydrogen atoms together to form helium atoms. As this change takes place, large amounts of energy are released. They pass through the star and escape from its surface as light and heat.