Aliens.
Halo was based on the future. The books were stories in before or in between the games. The order of the games go like this: Halo Reach, Halo Wars, Halo, Halo 2, Halo 3:ODST, and last Halo 3. Bungie and Microsoft plans on making Halo 4.
Thank you based god.
A city in Africa on earth called New Mombosa
Halo 1 and 2:The Xbox and Windows / Mac based-PCsHalo 3:Xbox 360
Halo 1, 2, 3, ODST, Halo Wars and Halo Reach for the Xbox Original and Xbox 360.
Halo Reach is essenetially Halo 4, but it is based before Halo CE (Halo 1). It is due to come out in Autumn (Fall) 2010. The beta is a multiplayer test of the game by owners of Halo 3: ODST and will begin on 3rd May 2010. There were also similar beta tests for Halo 2 and Halo 3. Halo 3 beta contained only matchmaking and 3 maps: Highground, Snowbound and Valhalla. Thus I expect the Halo Reach beta to be similar.
halo 3 obviously
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Halo 3: ODST is the newest of the two, but not the newest Halo game.
The halo time line goes Halo Wars, Halo: Reach, Halo:CE (halo 1), Halo 2, Halo: ODST, Halo 3. Halo 3 and ODST are practically at the same time.
Halo 3 legendary edition can be purchased for anywhere from $21 to $200. The price varies based on if you want to purchase it new or used.
Halo 3 ODST is not for PC but Halo 1 and maybe Halo 2-3 are