The purpose to this would be to see earth in the past
-using a a very very powerful telliscope
-I assume light may have to bend around multible objects to become reflected back.
-Could you design a computer program to tell the telescope where to point?
-I realize the earth is very dark relatively, would else could a telescope pick up from earth that would be bent around stars.
2006-08-13 06:19:58 · 6 answers · asked by Space Q&A 1 in Science & Mathematics ➔ Astronomy & Space
Yes it is possible only in theory. First let us look at the mecahanism involed. The reflected light by the earth should be deflected by 180 gdegrees. A U turn. A black hole or few successively arranged black holes can do this. Then it reaches the earth for you to see. This process obeys all the laws we know for now. So it is possible.
Now let us talk aut the reality
The reflected light by the earth is very weak. It can not go very far. The black hole has to be far away so that we are not pulled and digested. What is the possiblity of this happenning. I can assure it is zero.
2006-08-13 07:55:32 · answer #1 · answered by Dr M 5 · 0⤊ 0⤋
No. Light bends, or refracts at certain angles, and eventually reaches a limit that it cannot go past. This is known as the critical angle. It is different for different mediums, I do not know what it is in the vacuum of space. Light from the earth would have to reflect off something in order for you to see the earth through a telescope. However, this whole argument assumes you and said telescope are on the earth at the time.
2006-08-13 13:29:34 · answer #2 · answered by Paul W 2 · 0⤊ 0⤋
Light is not complex matter and has no gravity to hold it together. Light expands to fill a vacuum. Space is not a vacuum. It is a really low pressure system that behaves similar to a vacuum. As light passes an object, it creates what we call a shadow. Eventually, as the light continues to expand past the object, it fills in the shadow.
If you flying at night at 40,000 feet looking down and there is a search light pointing at you, you will see the search light. If someone places a mirror twice as large in the search light two feet above it directly between it and the plane you are in, you will see the light reflecting off of the search light's surroundings but you will not see the shadow caused by the mirror until you get closer.
2006-08-14 00:31:45 · answer #3 · answered by Anonymous · 0⤊ 0⤋
if you want to see earth from earth you might want to point the telescope out to a star that has a large mirror on it . or we could put an ITC cathode ray tube on the moon with a 3 way mirror . place a lithium ion camera inside the telescope and zoom into a loop . make sure earth is in the loop blue photons. this is a beginning of a theoretical possibility involving a new kind of technology to view earth from the past and the future through a astronomical telescopic technology . A telescope that has advanced itself into something of photonics and light emitting /mirror communication between earth and multiple planets placed in certain positions and light switching generators .... this is something to look into
2006-08-13 16:02:39 · answer #4 · answered by swanmode 1 · 0⤊ 0⤋
I doubt that anything would be able to create a U-turn in light, light is simple too fast for that.
2006-08-13 15:56:59 · answer #5 · answered by Science_Guy 4 · 0⤊ 0⤋
most of the other planets
2006-08-13 13:26:11 · answer #6 · answered by Anonymous · 0⤊ 0⤋