CRCT QuestionPtolemy believed the

__________ was the center of the universe.

A.SunB.EarthC.MoonD.Jupiter

Gravity

NicholasCopernicus

http://www.lucidcafe.com/library/96feb/copernicus.html

Geocentric

Ptolemy

A.D. 140

Reasoned that the Earth was the center of the universe.

http://web.hao.ucar.edu/public/education/sp/images/ptolemy.html

NASA

Inertia

http://www.pbs.org/wgbh/nova/galileo/images/scie_galileo2.jpg

Quiz• Make sure your name

is on it

• Put in SCIENCE bin when finished

Gravity Tricks

While standing up, bend over and hold your toes with your hands, keeping your knees

slightly bent. Try to jump forward in this position without removing your hands from your toes while

you are jumping. Can you do it? Bet you can't!

The Impossible Leap:

In this position, you can jump backwards from one end of the room to the other, but you won't be able to jump forward even a single leap! When we jump, we first shift our center of gravity in the direction we want to jump, and then we move our support base in the same direction to regain our balance. When you are holding onto your toes, jumping backwards is not a problem because you can use your heels. But to jump forward, you would have to use your toes... and your fingers are in the way

The Science:

Sit in a straight-back armless chair, keeping your back

against the back of the chair and your feet flat on the floor.

Fold your arms across your chest. Keeping your feet flat and your back straight, try to stand

up. Are you glued to your chair?

Super Glue Chair

In this sitting position, the center of gravity is at the base of your spine. By trying to stand up with your back straight, you prevent the center of gravity from moving to a position above your feet, which would be necessary to stand up. Therefore, you remain glued to your chair

The Science:

How the Solar System formed!!

Our Solar System

It was formed 4.6 billion years ago.

A star that explodes is said to have

goneSUPERNOVA. It produces a lot

of ejected matter.

HorseheadNebulain the ConstellationOrion

NASA

PlanetaryNebula

NASA

Formation of the Solar System

Shock waves from space started gravitational forces to spin and collapse the material found in the nebula. Most of the material fell to the center forming the sun (99% of the System’s mass).

Planets closest to the sun lost their low mass gases ( H and He) due to the heat from the sun.

These are the inner or

terrestrial planets.

NASA

Planets further from the sun kept their light gases and formed the gas

giants with small rocky cores.

NASA

Look at Pluto’s orbit. This is one reason it is not considered a planet.

Check out Pluto’s orbit!!!

Gas giants

http://www.windows.ucar.edu/

Scale of sun and planetsNASA

Outer atmosphere

Middle atmosphereGives sun its color

“Surface” emits light

NASAVideo clip of fusion in the sun’s core

NASA

NASA

Sunspot animationNASA

NASA

Granules: convection from inside the sun causes the photosphere to be subdivided into 1000-2000km cells that look like rice grains or kernels of corn.

NASA

Ultraviolet image of the sunNASA

X – ray image of the sunNASA

Solar prominence

Solar flaresMagnetic storms on the sun

NASA

NASA

NASA

NASA

Corona – seen only during

eclipse