How many people were killed in the space shuttle Challenger?

well i know that there was the Apollo 1 mission and three astthyronauts were killed doing just a test run, they couldn't get the door open when the oxygen tank blew up in flames. so they were sadthtuck in the ship burning alive. everybody saw it on television and it was live and all over the news. it was horrible. and it was only a test run. they werent even going anytrhuwhere. they weryukle just going to be sitting in the ship and controlling things and just doing what they do on a normal day to make sure everythnig is ok. but when they went in that day, the oxygen tank blew up and the inside of the ship went up in flames, perishing everything, and everyone.

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