Telascopes Flashcards
Visible light has very short wave lengths. How long?
Less them 1 millionth of a meter.
The electromagnetic spectrum includes:
Radio waves, infrared radiation, visible light, ultraviolet radiation, x-rays, and gamma rays.
How many stars can you see on a clear night
Almost a few thousand
Why can you see millions of stars using a telescope?
The light from stars spread out as it moves through space and your eyes are too small to gather much light.
What do telescopes do
Make objects appear larger and brighter
What do nonoptical telescopes collect and focus?
Different types of electromagnetic radiation, just as optical telescopes collect visible light
Where are telescopes usually located?
Observatories
Why do radio telescopes need to be large?
To collect and focus more radio waves, because radio waves have long wave lengths
When was the spitzer space telescope launched
2003
Very hot objects in space give off ______
X-rays
Where are x-rays locate?why?
Space.
They are blocked by earths atmosphere
Electromagnetic radiation
The energy transferred through space by electromagnetic waves
Visible light
Electromagnetic radiation That can be seen with the unaided eye
Wavelength
The distance between the crest of one wave in the crest of the next wave
Spectrum
The range of wavelengths of electromagnetic waves
Telescopes
An optical instrument that forms enlarged images of distant objects
Optical telescope
A telescope that uses lenses or mirrors to collect and focus visible light
Refracting telescopes
A telescope that uses convex lenses to gather in focus light
Convex lens
A lens that is thicker in the center than at the edges
Reflecting telescope
A telescope that uses curved mirror to collect and focus light
Observatory
A building that contains one or more telescopes
Radio telescopes
A device used to detect radio waves for an objects in space
