Why didn't the Avengers go to the past and stop Thanos ? || #shorts

Why couldn t the Avengers beat Thanos? Why didn't the Avengers just time travel to stop thanos? What was hulk time travel science? How Marvel time science work? Why do the Avengers need the stones? Why didn t Avengers use Time Stone? How did the Avengers get all the stones back? What was the main reason for the Avengers to collect the Stone? Why did the Avengers take the Infinity Stones? Hulk Explains Time Travel Theory #marvel #mcu #time #avengers #timetravel #marvelshots