What type of Star is this? 1. Main Sequence

2. Super Giant

3. Giant

4. White Dwarf

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

If one fission reaction of a uranium-235 atom produced two neutrons, how many neutrons would be released if the chain reaction occurred three more times?