Question

if we threw water in space and sunrays fell on it can a rainbow be made in space?

Answer 1

it is impossible to throw water in space no rainbow is formed
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Answer 2

The vacuum of space is very different from what we’re used to here on Earth. Where you stand now, surrounded by our atmosphere and relatively close to the Sun, the conditions are just right for liquid water to stably exist almost everywhere on our planet’s surface.

But space is different in two extremely important ways: it’s cold, and it’s the best pressureless vacuum we know of. Interstellar space has a pressure that’s millions or even billions of times smaller than Earth!

If we talk about going to interstellar space, far away from any stars, the only temperature comes from the leftover glow from the Big Bang: the Cosmic Microwave Background. The temperature of this sea of radiation is only 2.7 Kelvin, which is cold enough to freeze hydrogen solid, much less water.



So, if you take water into space, it should freeze, right?

No because if you take liquid water and you drop the pressure in the environment around it, it boils. You might be familiar with the fact that water boils at a lower temperature at high altitudes; this is because there’s less atmosphere above you, and hence the pressure is lower.

It’s incredibly difficult to change the temperature of water rapidly, because even though the temperature gradient is huge between the water and interstellar space, water holds heat incredibly well. Furthermore, because of surface tension, water tends to remain in spherical shapes in space, which actually minimizes the amount of surface area it has to exchange heat with its subzero environment. So the freezing process would be incredibly slow, unless there were some way to expose every water molecule individually to the vacuum of space itself.

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