If eveything has a shaddow.... Does the universe have a complete shadow?

Question

In theory is this possible?

Answer 1

No because shadows are formed when light shines on something and the object blocks the light from hitting another surface. The universe has no light shining on it, is mostly see-through anyway, and has no surface to cast a shadow on. Sorry to ruin your dreams!

Answer 2

Since a shadow is,

"An area that is not or is only partially irradiated or illuminated because of the interception of radiation by an opaque object between the area and the source of radiation.".

There is no way our universe can cast a shadow, unless there is something to cast a shadow on.

If there was another universe out in space, then yes it's possible, but I can't answer that.

Answer 3

no

Answer 4

Theoretically possible if:

A) There is some kind of reality outside the universe.

B) The physics in that reality are the same as our own (which would be highly unlikely).

C) There is a large source shining light upon one 'side' of our universe.

D) There is something behind the dark 'side' of the universe to cast a shadow on.

The likelihood of all of this criteria being met is extraordinarily low.

Answer 5

Everything has a shadow so long as their is light and space for that light to travel.

I don't think this is a sound theory. But I'm no physics major

Answer 6

Can the Sun have a shadow?  I suppose it could be lit up by a brighter star.  Some of the variable stars are binary pairs, where one is brighter and one is dimmer.  When the dimmer one passes in front, the whole system seems to dim.  That's the shadow.

The Visible part of the Universe can't have a shadow, because it's opposite  "edges" are moving away from each other faster than light.  The "edges" would overtake any shadow cast.

The whole Universe is like that, only more so.

So, even if you are very patient, and can wait a very long time, no shadow is cast.

And yet.  Let's say you have a candle.  And at five feet away, you pass a two inch square across the light from the candle  At ten feet away, the shadow moves twice as fast.  If you go far enough away, the shadow can move faster than light.  No information is transmitted faster than light, but the shadow can move that fast.  So, could a shadow move faster than the edges of the Universe?  I don't see how.

Answer 7

Only objects meeting certain criteria cast shadows, for the universe to cast a shadow, we would need a light brighter than the universe, and an object large enough to cast the shadow on to.

A shadow is a region of darkness where light is blocked by an object. It occupies all of the space behind an opaque object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or reverse projection of the object blocking the light.

An astronomical object casts human visible shadows when its apparent magnitude is equal or lower than -4. Currently the only astronomical objects able to cast shadows on Earth are the Sun, the Moon and, in the right conditions, the planet Venus