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Optical Fire
Imagine a fictional stellar shootout between two ships .. ?
lets say you have 3 ships being separated by 5 lightminutes each, forming a triangle. all three ships maintain their distances and travel same course with half the speed of light in a very light nebular (for optical reasons)
Now Ship A fires a 1 minute laserbeam on Ship B, destroying it.
Ship C takes photos.. what will these photos tell ?
What do they exactly observe, why and when ?
(This is NOT a homework question) 
any redshift/blueshift .... ?
First, if all 3 are moving in the same direction at the same speed, there won't be any relative motion among them, so the fact they are moving at .5c is irrelevant. Second, why specify 'photos'? Why not a continuous video? That way, whatever there is to see, will be seen. Ship A fires at Ship B at T=0 . Ship C will see Ship A fire on Ship B at T+5'. It will take 5 more minutes for the laser beam to reach Ship B, which Ship C will see at T+10'. One minute later T+11', Ship C will see Ship B explode.
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Generic Photo of Fire - Optical Illusion from StareClips.com
Is this used laptop valuable for $600 ?
Acer 1692Wlmi equip with intel pentium M processor 740 1.73 ghz, 533 mhz FSB, 2MB L2 cache, this laptop equipt with Ati mobilty radeon x700 PCI express with 128 mb(independent not Share memory), 15.4 " wxga crystalbrite tft LCD, 80 gb HDD aLready partition, slot loading DVD-dual(support DVD+R double layer/dvd +- rw), 512mb DDR2 ram support dual-channel, 802.11 b/g wireless lan, built-in bluetooth, and 5 in 1 card reader...
Free with :
5.1 CREATIVE USB SOUND BLASTER(SOUND CARD), SONY DUAL SHOCK GAME PAD(ORIGINAL)+ USB GAME PAD CONVERTER BRAND ROCK FIRE, LOGITECH NOTEBOOK OPTICAL MOUSE , TARGUS BAG, COME WITH ORIGINAL WINDOW XP HOME AND ALL DRIVER AND SOFTWARE
That's not a good price. You can get a better, brand new laptop for that much.
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