I Get Fiercely Hot. I Vary In Sizes

Riddle: I get fiercely hot. I vary in sizes. Without me, the moon is all we'll see. It's impossible to walk into a room without at least one of me in them. What am I?

Answer: A lightbulb.

Source: https://www.riddles.com/2337

I get fiercely hot. I vary in sizes. Without me, the moon is all we'll see. It's impossible to walk into a room without at least one of me in them. What am I? — I get fiercely hot. I vary in sizes by Josephine v1.

Riddle: I get fiercely hot. I vary in sizes. Without me, the moon is all we'll see. It's impossible to walk into a room without at least one of me in them. What am I? Answer: A lightbulb. — by Josephine v2.