Astronomers claim galaxy record

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[replyIt would fade to red and then become invisible. The photons would still be reaching you, but they'd be shifted into the infrared, then into the microwave, and finally into the region we consider radio.

[kallend 2,151]

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So...we could screw with other civilizations by receiving them, shifting them back up in the spectrum and then re-transmitting them.

We already screw with them by transmitting re-runs of I Love Lucy and Star Trek.

...

The only sure way to survive a canopy collision is not to have one.

[dorbie 0]

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>what would things look like when you sped up? as you approached a
>radio tower, would the doppler effect cause the antenna to become visible,
>first looking red, the shifting to violet as you sped up?

Yep. That's a very big shift, so you'd have to be quite close to lightspeed to see it though.

>and what would it look like if you looked behind you, would everything
>disappear?

It would fade to red and then become invisible. The photons would still be reaching you, but they'd be shifted into the infrared, then into the microwave, and finally into the region we consider radio.

What's the initial relative velocity?

If you're travelling towards a tower it's blue shifted as you pass it changes to red shifted.

If you accelerate towards a tower it becomes more and more blue shifted. If you start off travelling away from a tower and accelerate towards it it will transition from a red shift to a blue shift.

If you accelerated towards the background radiation you could never catch it, the event is in the past. As you traveled faster and faster it would be less red shifted in front and more red shift behind.

There are lensing effects too. The light from stars to your side would appear to arrive from nearer the front of your vehicle as you intercept the photons that left diagonally in the star's frame of reference. Stars behind would spread apart and dim due to this same effect. Everything on the visible sphere would appear to be sucked in towards a point in the direction of travel.