Edxcel P1 (Topic 1)

Geocentric Model: Ptomrly devised it that everything revoloved around Earthas the stars are rise and set therefore we are at the centre and the Earth doesn't feel like it;s moving. Flow is when observing Jupiter and Saturn at night for a few months in a year, it appears to move backwards. Retrograd motion is the change in direction of the motions of planets as seen from Earth. If venus orbited the Earth, then we would only be able to see crescent shpe. The Geocentric model couldnt explain this.

Heliocentric: The Earth and all plantes orbit the sun, this was proposed by Cornepicus but was condemn by the Church. The most convicing piece of evidence was the observation by Galieo of Jupiters moon by using a telescoe. He used a convex and concave lens. The fact that th moons never moved away from Jupiter and seemed to carry along with the planet shows that not everything centred around the Earth.

Scientist detect waves from objects in space, some objects like stars are huge, hot or faraway. They give out a lot of visible light. Naked eye has made important dicoveries of stars, comets and planets, but only good for mapping out positions. Telescopes magnify images so distant objects can be seen in more detail and also see objects at larger distances. They've helped us learn more of what the universe is made up of, telescopeson Earth have problems so space telescopes overcome this but are very expensive. Photographs can be taken by telescopes so that you can zoom in and look at the objects in more detail. It is easier to monitor a object by taking pictures at different times to compare and share observation. Faint objetcts can be seen by allowing a 'long exposure time' to collect more light, this cannot be done with the naked eye.

Concave lens are thin in the middle, but thick at the edges. Convex are thick in the middle and thin at the edges

Refracting telescopes.

Refracting telescope uses a convex lens. A convex lens bends light and brings it into a focus because of the properties of it's thin edges it refracts light at a huge angle, more at the edges than the centre. It converges the light into a focal point. Ths is where all the the light meet and this is where the image is formed. The eyepiece a concave lens magnifies the image. The lens spreds them out so they leave at a wide angle then thy enter so the light rays fill more of your retina. The  Primary lens or convex lens gather the…