Astronomy lesson 1

Astronomy

The study of the universe which is everything that exists ,including Earth ,the planets ,the stars and all space.

Telescope

• A device that collects light and magnifies images to make distant objects appear closer ,larger and brighter.

Types of Telescopes

Using invisible lightAny light frequency in

electromagnetic spectrum that people cant see

Using visible lightThe light that you can see and detect with your eye

Visible light Telescope

Refracting Telescope

Reflecting Telescope

Refracting Telescope

• It uses lenses to gather light from faraway objects .• In refracting telescope the light is bent and focused on objective lens.• The image is then magnified by lens in the eyepiece.

Reflecting Telescope0

• Visible light reflects off a series of 2 or more mirrors, which amplify the image before it reaches the lens in the eyepiece.

What kind of telescope would you expect to find in most observatories?• It is easier to build large mirrors together more light so most large telescopes are reflecting telescopes.

Invisible light Telescope• Invisible light frequency in electromagnetic spectrum that people cannot see.• Special telescopes can detect waves such as radio waves ,radar, infra red waves ,ultraviolet light , X-ray.• These telescopes can gather information that cannot be observed using visible light.

Why might astronomers study objects in space with an infrared telescope?

To gather information not obtainable with visible light ,like X-rays.

Earths’ Rotations• The Earth has 2 types of Movements:1) Rotation of Earth around itself (its axis)

2)Rotation of Earth around the Sun(The path in which the Earth rotates around the

Sun is called Orbit )

1)Earth’s Rotation around Its AxisEarth’s axis

is an imaginary line that passes through the north

and the south pole

The part of the Earth away from the Sun

Night

The part of the Earth facing the Sun

Day Time

• The Earth takes 24 hours to rotate around its axis or itself .• This rotation results in Day and Night

Where the part of the earth facing the sun is “Day time” And the part away from the sun is “Night”

Standard Time Zone• In 1884,standard time were set up in 24 time zones around the

world.• Each time zone represents one hour of the 24 hours of the

day .• All the places within the same time zone uses the same time.• If you travel east from one time zone to the next the time is

increased by 1 hour ,and if you travel west the time is decreased by 1 hour.

World Time Zone

Africa Time zone

USA Time Zone

If it is 8:00 pm mountain standard time(Denver) .What time is in Atlanta which is found in Eastern Standard time ?

International Date Line

What would happen if you traveled west across the “International Date Line”?

Shadow

Shadows

Exploring SpaceSpace probes send images and data back to Earth for scientists to interpret.Artificial satellites are sometimes sent into space by astronauts on a space shuttle (reusable spacecraft).After the mission astronauts ride back to Earth in the shuttle.“Hubble Space Telescope”

What is the difference between planetary images taken from Earth and those taken from space?•Images taken from Earth would have less sharpness and detail than those taken from a satellite or a probe because Earth’s atmosphere would interfere with the quality of photos

2)The Earth’s Revolution around the Sun

• The rotation of Earth around the sun results in

Four Seasons