Transcript Waves and Telescopes

JOURNAL #14 – WAVES AND TELESCOPES
1. How much of the electromagnetic
spectrum can we see as visible light?
2. What was the name of the first artificial
satellite?
3. What mission landed man on the moon?
WAVES AND TELESCOPES
Objective: Understanding the
electromagnetic spectrum and visions of
space through time.
ELECTROMAGNETIC SPECTRUM
• Waves – how energy travels through space
• Mechanical Waves: cannot travel through
empty space; sound wave
• Electromagnetic Waves: microwaves, radio,
visible light
ELECTROMAGNETIC WAVES
• Electromagnetic Waves
• Travel at a speed of 300,000 km/s
• Length Decreases, Frequency Increases
TELESCOPES
• Refracting Telescope
• Light passes through a convex lens to form an
image at a focal point
TELESCOPES
• Reflecting Telescope
• Light is reflected off of a concave mirror to
form an image at a focal point
TELESCOPES
• Radio Telescope
• Radio waves strike a large, curved dish and
are reflected to a receiver
TELESCOPES
• Observatory
• A large building that houses a telescope
• Domed roof that opens
TELESCOPES
• Hubble Space Telescope
• Reflecting telescope
• April 25th, 1990
• Unclear images due to incorrectly shaped
mirror
• December 1993, astronauts replaced the
mirror
TELESCOPES
• Purpose of Telescopes
• Produce better images because Earth’s
atmosphere absorbs and distorts energy from
space
• Should be above the atmosphere
• Galileo Galilei perfected the telescope in 1608
SATELLITES AND SPACE PROBES
• Satellite
• An object that revolves around another
• First artificial (man made) satellite: Sputnik 1
• Launched by former USSR, 1957
• Orbit Time: 3 months
SATELLITES AND SPACE PROBES
• Earth’s Natural Satellite
• The moon
• Orbit Time: 1 month
SATELLITES AND SPACE PROBES
• Space Probe
• Instrument that gathers information and sends
it back to Earth
• Carry cameras, radio transmitters, receivers,
weather instruments, earthquake detectors,
etc.
SATELLITES AND SPACE PROBES
• Viking 1 (1975)
• Mapped Mars
• Lander searched for life
• Magellan (1990)
• Mapped Venus
• Probed atmosphere
SATELLITES AND SPACE PROBES
• Voyager 1 & 2
• Passed outer planets
• Now resides in deep space
• Galileo
• Studied Jupiter
• Probed atmosphere
PEOPLE IN SPACE
• Yuri Gagarin
• USSR, 1961
• First to orbit Earth; 108 minutes
• Project Mercury
• Goal: orbit piloted spacecraft around Earth
successfully
PEOPLE IN SPACE
• Alan B. Shepard
• First US citizen in space
• 1961
PEOPLE IN SPACE
• John Glenn, Jr
• US, 1962
• First US citizen to orbit Earth
PEOPLE IN SPACE
• Project Gemini
• Goal: two teams of astronauts to meet and connect their
spacecraft's in space
• Essential for return trip to the moon
• July 20th, 1969 Apollo 11 landed on the moon with Neil
Armstrong, Edwin “Buzz” Aldrin, Michael Collins