study guide Flashcards
most important lens in the refracting telescope? and what does it produce?
objective lens, produces an image by bending light from a distant object so that the light converges at the “focus”.
what does the chromatic aberration do to the image?
it s the troublesome effect, and weakens the image and produces a halo of color around it.
what do reflecting telescopes use?
it uses a concave mirror that focuses the light in front of a mirror, rather than behind it, like a lens.
what are large optical telescopes mostly?
reflectors
refracting and reflecting 3 properties that guide astronomers:
1) light-gathering power
2) resolving power
3) magnifying power
answer the back
-telescopes or mirrors with large lenses see farther into space than smaller ones-
what is produced by stars?
gamma rays, X-rays ultraviolet radiation, infrared radiation, and radio waves
what is the main material that which makes stars?
HYDROGEN
radio telescopes -
detects radio waves and are big dishes, it focuses the incoming radio waves on an antenna which absorbs and transmits these waves to an amplifier.
where do space telescopes orbit and what do they produce clearer?
above earths atmosphere and produce clearer images than earth- based telescopes .
Hubble space telescope:
first space telescope built by NASA, and put into orbit around earth in April 1990. This telescope has 10 billion times more light-gathering power than the human eye.
the sun is earth’s__________ __________ of __________!
primary source of energy
compared to other stars, the sun is an “___________” star
average
the sun can be divided into four parts:
1)the solar interior
2)the visible surface or photosphere
3)two atmospheric layers;
chromosphere
corona
sunspots
appear dark because of their temperature and are seen on the surface.
