system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a theoretical maximum size limit for a star?
gpt
One guy from the Space Telescope Science Institute had a look  for massive stars on the Hubble telescope

"We expected to find 20 to 30 stars with masses between 130 and 1,000 solar masses," Figer said. "But we found none. If they could have formed, we would have seen them." 

He set the limit at 150 solar masses.  If a gas cloud/ proto star is too massive, radiation pressure would probably destroy it.