How did the planets of our solar system form?

Scientists think that the Solar System formed millions and millions of years ago. It began as a huge cloud of gas and dust in space.

The swirling cloud of gas and dust slowly got thicker and thicker.

Part of the cloud heated up making a hot ball of gas. This became the Sun.

Over millions of years, the gas and dust spun around the Sun.

Gradually, the dust and gas joined together to make the planets.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .