With so many people calling me ignorant, I suppose I will have to admit defeat. It still seems impossible to reach these speeds in atmosphere, and I will stand by that assertion. However, once it gets to space, I really have no claim to make about what is possible.
In fact, I will go so far as to say, I don't know anything at all about space. As far as I'm concerned, this is a realm where literally anything can happen. I will never go there, I will never see it. I will only receive what NASA, SpaceX and other authorities tell me about it.
If I can please ask some people who have commented to indulge me with a final request on this topic?
I would just like to summarize some of the facts that people have put forth on this topic, and make sure I clearly understand. I know this may not be the best place to ask these questions, but I would greatly appreciate your input as a way to reach some level of closure for myself.
1. I've learned that air slows the rocket a lot. It can only reach 3,000 mph in atmosphere, but 18,000 mph at the edge of space. That increase is due to the lack of air resistance.
2. The atmosphere has essentially no effect on the amount of thrust. Whether in atmosphere, or in a total vacuum, the same level of thrust can be achieved.
Am I getting this correct? Any more information or corrections is greatly appreciated. Again, thank you for input, and allowing me to express my opinions on this matter.