[QUOTE=Voyager]
You’re forgetting another counter-example - Yavin. The first Death Star went boom realtively close to Yavin - it was orbiting the big planet Yavin was orbiting also, it had line of sight, and it was close enough to use the weapon. However we see the ceremony at the end of ANH, which had to take place long enough after the battle for R2 to get repaired and Han to shave, and no one was looking nervous. There were no natives to evacuate, so there was no reason to stick around if they were at any risk.
I’d guess that the power plant going made tiny pieces of the DS, and they burned up in the atmosphere with no ill effects. (Or minor ones.) Also, there was less to DS 2, unfinished, than DS 1.
[/QUOTE]
I thought about this one, and there are some critical differences.
The Death Star 2 was in low orbit over the Endor moon (so low that I would imagine some anti-grav thingy was keeping it from crashing.) Remember, it was plainly visible in the day sky, and it seemed to have a larger aspect than our own moon. If it was the size of a “small moon”, and appeared larger than the moon does in our own sky, then one may assume that its orbital radius was much smaller than that of the Earth-Moon system. When the DS2 blew, it really had no place to go but straight down into the Ewok’s homeworld.
The first Death Star, on the other hand, was not anywhere near the Yavin moon that the rebels were hiding on. Yavin was a huge Jupiter-sized gas giant, the rebels were on its moon, and the Death Star was steering around Yavin in order to get the moon in line-of-sight.
Some conclusions:
First, the Death Star was at least as far away from the moon as the moon was from Yavin, and probably a lot farther. I’ve seen the handle “Yavin IV” tossed around, suggesting it’s the 4th moon out. For comparison, Calliosto is Jupiter’s 4th moon, and has an orbital radius which is nearly 5 times that of the Earth-Moon system.
Secondly, it suggests an orbit which, if unassisted, would slingshot the DS past Yavin and make it miss the rebels’ moon, at least on the first pass.
Thirdly, the rebels were celebrating inside that huge stone temple. If there’s a threat of flaming chunks of radioactive metal falling from the sky, then I too would want a million tons of stone above my head.
Fourth, and this is perhaps the most important point, the Yavin moon had no annoying sentient teddy bears. I have invested no emotional interest in believing that the Yavin moon was destroyed. 