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While it's not unheard of for people to have doppelgangers, the odds of the doppelganger having the same name and being the exact same age (law professor lists her year of birth to be the same as the Challenger "astronaut") are much smaller, but the kicker is that 6 of the 7 have been located, all of whom have the same last name and are the same age, most of whom either have the same first name or else shifted to using their middle names (in one case the opposite, "Sharon Christa McAuliffe", used to go by "Christa" and is now using her actual first name, "Sharon McAuliffe").  2 of the ones who have been found claim to be "identical twins" of the Challenger ones ... but no record has ever been found of these identical twins existing before the Challenger incident.  What are the odds of 2 out of 7 astronauts having identical twins?  What are the odds of 6 or 7 having doppelgangers of the same age, with the same last name, in some cases also same first name, in other cases shifting to middle name from first or first from middle?

What what be interesting to find out is whether this was a planned or an unplanned deception.  Were "astronauts" GENERALLY never actually on board the space shuttle and then when this one blew up (unintentionally), there was an "oops!  what do we do about the astronauts who are still down here?" ... or whether the astronauts were not on board just for this mission and they planned to blow it up.  It is interesting that, due to the "teacher in space" thing with this mission, many school children were watching the mission live on TV when the explosion happened.  Many people can remember "where they were" when this happened, and it does create a strong psychological impression to watch a space shuttle blow up that allegedly has astronauts on board.

It's stuff like this, and evidence of one deception after another by NASA, that makes a lot of flat earthers simply dismiss any evidence that comes from NASA.  It's one hoax after another.  Hundreds of videos of obvious hoaxing of ISS footage.  If they have astronauts on ISS, why hoax the video footage?  Obvious hoaxes of "Mars rover" footage have been exposed, where some landscape scenes are IDENTICAL to places on earth (Greenland or Devon Island) ... not look similar, but are identical, including every rock being the same size and shape and in the exact same place, the only difference being a reddish tint imposed on the "Mars" image.

I was actually working for NASA at Mission Control in Houston when the Columbia explosion took place, so this leaves me wondering whether that one was also a hoax.

Great video.

I bet people have been convicted with only a 0.0001% of the amount of evidence you can find to support flat earth.

Too many coincidences for it to be a mere fairy tale.

I fail to draw the connection from "NASA faked the moon landing and Challenger mission" to "the Earth is flat".

Yes, the Earth is immovable in the center of the universe, see the excellent study by John Daly attached. What you will notice is that in the entirety of the proceedings against Galileo nothing is said about the shape of the Earth. Nothing.

Could you point me to a study that demonstrates we are obliged to believe in a flat earth?

I've seen many scientific proofs from both sides that seem equally devastating but I ultimately can't verify either. The globe model seems to have a much stronger case from what I've seen.
The Anatarctica BS is where the flat earth argument falls apart the quickest. cօռspιʀαcιҽs like these are sure to be discovered at some point with incontrovertible evidence like the moon landing was.