It wasn't exactly blown up. It was glassed, but not in the normal way, either. Glassing is sending streams of plasma down on a planet, and the heat created wipes out most life forms on the planet, sometimes making material (including organic material) into glass, hence its name.
However, Reach was a bit different.
The covenant detected forerunner artifacts on the planet, so they didn't completely glass the planet, as they were afraid completely glassing the planet would destroy the forerunner artifacts they held so dear. They only glassed the major military sights, leavinglarge pockets of life on Reach.
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It got glassed the most of any planet since it was a military base.
after Halo reach,there is no more In total, there is :Halo 1,Halo 2, Halo 3, Halo ODST, Halo wars and Halo reach
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No, Halo Reach shows what happened before Halo 1. In fact, in one of the missions in halo reach, you can see Master chief
halo,halo 2,halo 3,halo3 ODST,halo wars,halo reach