Re: some query regarding astronomy


"nilesh" <nilesh.deo@xxxxxxxxx> wrote in message
news:1180332450.979375.254320@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
: here is the Q
:
: First Question
:
: why at night we do not see any stars near the horizon but if we raise
: the viewing angle then we are able to see the stars .like if the
: horizon is 180 degrees then we don not see stars till it is around 140
: deg. and we are able to see the stars from 140
:
: what might be the reason


Light refraction by atmosphere.
http://www.astronomycafe.net/weird/lights/mirage6.jpg


:
: Second question
:
:
: it is about stars and speed of light--
:
: we know that the speed of light is 3 L /sec so it takes arnd 8 mins
: for the light from sun to reach earth....i.e light emitted at this
: very particular moment from sun will be received after 8 mins at
: earth.
:
: well lets increase the distance ..... is a star is suppose 5L light
: years away from earth.A supernova occurs at this particular moment ,so
: the last light of the star will reach earth after 5L light years
: CORRECT?


Oh, you can use capital letters. Now all you need to learn is how to place
them correctly.


: so what ever we see now at this particular time has actually happened
: happened some time back suppose 5L yrs Back in this case.
: then how are we able to decide that the star is dead or not.
: and if we want to go to the star,we planned a manned space mission for
: the star then when we reach there the star is already dead so wont we
: be waisting money of the mission!!!!!!.
:
:
: please reply...
: any ideas.....
: lets discuss this
: bye

Nobody is planning a manned space mission to a star.


.

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