Activity for A good username‭

Type	On...	Excerpt	Status	Date
Question	—	Would this type of atmosphere be suitable for human life? I've been trying to create a Earth-like planet but I'm not sure if my planet's atmosphere is breathable. (It's mostly the amount of helium I'm worried about). I've tried to make it Earth-like while making it alien with respect to Earth's atmosphere. Here are the atmosphere's numbers: atmospheric pre... (more)	—	over 6 years ago