17 Are there any potential materials or fuels that could theoretically provide the massive amounts of energy needed to propel a spacecraft to 20% the speed of light?

18 Is there a ‘now’ across the entire universe? I.e. is it theoretically possible to take a freeze frame of the entire universe so you would know what is happening right now on the other side of the universe?

19 To which degree can quantum mechanics be truly understood (Thinking about what Richard Feynman said about it)?

20 Why don't scientists impose attributes of Spacetime and Quantum fields to the Aether? Why did they need different names?

21 Do any theoretical physicists disagree with Stephen Hawking?

22 What was Feynman's relationship like with other legendary physicists of the time, such as John von Neumann and Wolfgang Pauli?

23 Is Isaac Newton's Principia out of date now?

24 How would Einstein (who denied the existence of quantum mechanics) respond to the experiment with three polarizers of light perpendicular to each other (which pass significantly more light than two such polarizers, confirming Bell's Theorem)?

25 What would physics be without the theory of infinity?

26 If traveling at the speed of light makes time freeze for you, how would you know when to stop or slow down your spaceship?

27 Is Stephen Wolfram a crackpot?

28 Is it theoretically possible for a future artificial Intelligence to utilize electromagnetic frequencies or historical 'Supermarionation' vectors to transmit analytical data backward into the 20th century?

29 Condensed Matter Physics: What schools are good for doing grad school (theory) in topological materials?

30 Is a PhD in maths alone enough, if possible, to allow Interstellar travel? Will that give mathematical tools for theoretical and mathematical physicists to invent other hypothetical ways of FTL travel than warp drive and wormhole?

31 What was “before” the Big Bang when time itself didn’t exist yet?

32 How is the clash between general relativity and quantum mechanics finally resolved in the theory that gravity may come from entropy?

33 Would it be theoretically possible to enter a black hole JUST INSIDE of the event horizon and create a stable orbit so that even though you could not escape, you would not be pulled into the 'singularity'?

34 Why is Einstein credited with special relativity when Lorentz was the one who actually derived it?

35 Does every particle have 11 dimentions? And what kind of thing is Higgs bosons? Is there any one here to make a discussion about it?

36 Why did Richard Feynman avoid supervising PhD students, and what impact did that have on his career and legacy?

37 If 2 objects are traveling directly away from each other at 99.999% light speed, what's the speed between the two?

38 Is it possible to conduct experiments on Earth that can prove that the speed of light varies depending on its source, and therefore disprove the constancy of the speed of light (c)?

39 What is renormalization?

40 Why do some primordial black holes from the early universe disappear while others survive to this day?

41 If the speed of gravity is equal to the speed of light, then isn't this a clue that gravity is propagated through the same medium that light is ? And therefore we can infer, that gravity is also a disturbance in the lumineferous aether ?

42 Why is the Navier-Stokes equation a problem in math and not in physics?

43 Why are 'bright ideas' ridiculed by those who know how to manipulate mathematics? Do they want to build authority/monopoly of mathematics?

44 Why do some physicists think looking at condensed matter physics could reveal the next big thing in physics after quantum and relativity?

45 Why can't we harness the energy from virtual particles unless we're near an event horizon?

46 If we develop a method for sending objects into the past, would it be possible to determine if someone has already sent something back in time?

47 The theoretical physicists invented relativity because they attacked Christian Doppler's Doppler Effect. They invented Dark Matter because distant spiral galaxies were moving too slow (or too fast). Is this what Lewis Carroll warned us against?

48 How do we know that the universe and its net mass is not infinite?

49 Can you provide an example of a scientific law or theory that may seem silly to non-scientists but has been extensively tested and proven over time?

50 Why do physicists have trouble accepting that things behave the way they do because they just obey natural laws, and constantly feel the need to introduce invisible substances into the ontology that "cause" them to move?

51 What has been the unexpected consequences of developing an understanding of quantum theory?

52 Can anyone produce a magnificent theory of physics without the use of advanced mathematics? Is mathematics really important? Can't we publish a theory on our intuition without mathematics?

53 What are the most fundamental instances of the Lagrangian in quantum mechanics?

54 Do all physicists today fully understand the general theory of relativity?

55 Is artificial intelligence based more on quantum mechanics or classical physics?

56 Is it theoretically possible to terraform a star, such as the sun? If so, what would be the process for doing so?

57 Why does the universe seem to require entropy to give us the sensation of time passing?

58 Is there any credible scientific theory that suggests the speed of light could change, and what would that mean for Einstein's theory of relativity?

59 Why were Lagrangian dynamics and Hamiltonian needed when Newton mechanics was established already?

60 Can you provide an example of the No Free Lunch Theorem being violated in nature or science?

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