What is the basic meaning of a black hole?

A. ऐसा क्षेत्र जहां gravity इतनी strong हो कि light भी बाहर न निकल सके / A region where gravity is so strong that even light cannot escape

Step 1: Identify the astronomy object. Step 2: A black hole has very strong gravity so even light cannot escape from inside the event horizon. Step 3: Remember black hole equals light cannot escape.

Step 1: astronomy object पहचानें। Step 2: Black hole की gravity बहुत strong होती है इसलिए event horizon के अंदर से light भी escape नहीं कर सकती। Step 3: Black hole equals light cannot escape याद रखें।