4
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I can look through like superman,

and could even save your life.

I can fly faster than a jet,

but I'm not out of this world

You won't even know I'm there,

so frequently,

I'll be gone in a whistle.

What am I?

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8
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Could it be

Sound?

I can look through like superman, and could even save your life.

Ultrasound can produce a sonogram - useful in medical applications

I can fly faster than a jet, but I'm not out of this world

Sound waves move faster through air than many jets, but do not travel where there is no medium (a vacuum)

You won't even know I'm there

In most cases, you cannot see sound waves

so frequently, I'll be gone in a whistle.

This one, I'm not sure about. I thought, perhaps, the Doppler effect, but that would make a higher frequency while approaching rather than receding.

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4
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Made me think of

X-Rays

I can look through like superman,
and could even save your life.

Used to scan your body

I can fly faster than a jet,
but I'm not out of this world

Both frequency and speed of x-rays are extremely high. Yet they are nothing imaginary or fantastical (like superman)

You won't even know I'm there,

X-Rays are not visable to the human eye

so frequently,
I'll be gone in a whistle.

A hint towards waves ;) ?

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  • 2
    $\begingroup$ I'm thinking this can't be the right answer because they're found in space, aka out of this world $\endgroup$ – Moose Jun 21 '16 at 15:44
  • $\begingroup$ I think this only means they are nothing fantastical $\endgroup$ – Avigrail Jun 21 '16 at 15:46
  • $\begingroup$ Close, but @Moose is right $\endgroup$ – Melkor Jun 21 '16 at 17:03
3
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I think the answer is

x-rays

I can look through like superman,

x-rays are used to view inside the human body and other solid objects

and could even save your life.

x-rays can detect things like internal injuries

I can fly faster than a jet,

x-rays move at the speed of light

but I'm not out of this world

very common to find x-rays in use

You won't even know I'm there,

can't see, smell, taste, feel, or hear x-rays

so frequently,

I'll be gone in a whistle.

not sure on this one...

Maybe I'm thinking way too literally

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2
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I think it's

sound.

I can look through like superman,

You can see through with sonar.

and could even save your life.

Cry for help.

I can fly faster than a jet,

However, some jets fly faster than sound.

but I'm not out of this world

Sound is an in-atmosphere thing. There is no sound in space.

You won't even know I'm there, so frequently,

White noise in background, even in "silence".

I'll be gone in a whistle.

Whistle is a sound.

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-1
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I can look through like superman,

Silence can look through bodys, rooms.

and could even save your life.

If you stay silent. In times your life can be saved.

but I'm not out of this world

Silence is there everywhere.

so frequently,

I'll be gone in a whistle.

If you blow a whistle, thats the end of it. Silence goes

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  • $\begingroup$ Welcome to puzzling.stackexchange. When solving a riddle please explain as many clues as you can and use the spoiler markup. $\endgroup$ – Marius Jun 22 '16 at 7:53

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