Did you know that Captain Marvel can time travel? That's exactly what he does in Captain Marvel Adventures #79. (Note: I've also read other editions where Cap does this but I failed to get the edition number - I'll update this once I find them!)
Captain Marvel exceeds the speed of light to escape the known universe and arrive at the Rock of Eternity (Note: He thus proves Einstein's theory!!). Upon reaching the Rock, Cap uses his 'amazing abilities' to follow the time-line into the past and accurately reach the exact point in time he was looking for! The World's Mightiest Mortal doesn't need a time machine or high-tech DeLorean to time travel!
Did you know Captain Marvel can time travel? I didn't until I read this edition of Captain Marvel Adventures!