what channel is that?. visible light is a form of electromagnetic radiation. others include: ...
TRANSCRIPT
What Channel is That?
Visible light is a form of electromagnetic radiation.
Others include: Radio waves Infrared waves (heat) Ultraviolet waves X-rays Gamma rays
Radio Astronomy: Use of radio waves to learn about composition of
stars
Are a very important type of EMR in our daily lives!
Objects in the universe also emit radio waves.
Radio telescopes capture radio waves emitted by radio objects. they allow scientists to “see” objects never seen
before because radio waves penetrate through dust particles where visible light cannot.▪ Computers are hooked up to radio receivers that
convert the radio waves into a colour picture for us to see.
Interferometry: Methods of connecting two radio
telescopes together to produce one large telescope (like light telescopes)▪ Example: Very Large Array (VLA) in New
Mexico▪ Very long baseline interferometry (VLBI)▪ Uses computers to connect as many radio telescopes
as they want together to produce an image. Images can be seen up to 100X in detail
There is a radio dish in space Allows scientists to make a telescope
twice Earth’s diameter,▪ They can image objects over 13 billion light
years from Earth!
Built the first radio antenna
Discovered radio waves that were interfering with telephone calls were coming from space!
Radio waves are recorded and graphed
Today, computers incorporate color for signal strength
Astronomical Unit (AU): is the distance from Earth to the Sun (150 million km)
1 light year = 9,460,800,000,000 km = 63,240 AU
Astronomers measure astronomical distances in light years – how far lightcan travel in one year.
Make an Electromagnetic Spectrum! Include:
All types of EMR One fact about each type Wavelengths (diagram and numbers) Frequency (numbers)