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Asteroids


Asteroids are mini planets or planetoids that orbit the sun.


Name two properties of asteroids.

- mostly orbit between Mars and Jupiter


- large rocks that were left over from formation of the solar system

Asteroid or planet


How were all bodies in the solar system formed?

When clouds of gas and dust collapsed together due to gravitational forces of attraction.

1. What does the gravitational force determine?




______ gravitational force prevents _____ from joining together to form another _______

1. The mass of an object


Jupiters


Asteroids


Planet

Origin of the moon


What do scientists believe the result of our moon was?

- collision between two planets in the same orbit


- iron from one planet melted and joined to earths core


- less dense rocks began to orbit and joined together to form the moon

What scientific evidence is there to support this view?

Average density of earth = 5500 kg/m3 while the moon is 3300 kg/m3




No iron on moon




Earth and moon has equal oxygen composition

Evidence for asteroids


Theory that asteroids collided with earth:


- found quantities of the meta, iridium ( a metal not normally found in earths crust but common in meteorites



- fossils are found below the layer of iridium, few fossils found above it


- tsunamis have disturbed fossil layers, result in fossils fragments being carried up to 300km inland

A comets orbit


1. Where do most comets orbit?



1. They pass through the orbit of mercury and well beyond Pluto.

As the comet passes close to the ___, the ___ melts and solar winds blow the _____ to the comets ____ which always points ______ from the sun.

Sun


Ice


Dust


Tail


Away

What things do scientists monitor?

The path of comets and NEO near earth objects

Why does the speed of a comet increase when it is close to sun and decrease as it is further away?

Because of the change of gravitational attraction.

NEO's


If an NEO was in course of collision with earth which if collide can be the end of earth life, what do they do to prevent this?

Explode a rocket into space to alter the course of the NEO