LT 3: LT 3: I can compare refracting and reflecting I can compare refracting and reflecting

telescopes.telescopes.

Refracting Telescopes– Use lenses to bend light

(refraction) Objective lens gathers

light Eyepiece lens magnifies

the light

– Lens focuses different wavelengths of light at different distances which limits the size of the objective lens.

Reflecting Telescopes– Uses mirrors to gather

and focus light Light is reflected off of

one lens onto a 2nd mirror which then reflects the light to the eyepiece

Mirrors can be very large without affecting the quality of the image

Telescope: an instrument that collects EMR from the sky and concentrates it for better observation.

LT 4: LT 4: I can explain how telescopes for nonvisible I can explain how telescopes for nonvisible

electromagnetic radiation differ from light telescopes.electromagnetic radiation differ from light telescopes. Nonvisible EMR

Telescopes– Each type of EMR must

have its own telescope– Affected by Earth’s

atmosphere– Most of these telescopes are

in space Hubble Space Telescope Chandra X-ray

Observatory Spitzer Space Telescope

(infrared telescope)

Light Telescopes– Reflecting and

Refracting Telescopes– Largest Reflecting

Telescopes are in HI

Keck TelescopesKeck Telescopes

Other SpacecraftOther Spacecraft Voyager 1 & 2

– Launched in 1977– Investigated Jupiter, Saturn, Uranus, and Neptune

Galileo– Orbited Jupiter and its moons from 1995 – 2003

Cassini-Huygens– Launched in 1997 and began orbiting Saturn in 2004

Spirit & Opportunity– Explore Mars beginning in 2004– Confirmed water had once been on Mars

Curiosity– Most recent rover sent to Mars– Started exploring the surface in Summer 2012

Other ExplorationOther Exploration

Humans first went into space in 1960s 1969-1972 NASA landed 12 people on the

Moon 2 major Shuttle losses

– 1986 Challenger– 2003 Columbia

Satellites– Provide weather information– Broadcast TV signals– GPS