Recent content by Guarana

My apologies. I meant 2,5 bilions.

Isn't Universe 13,8 bilion years old?

Researching! I think it's a, because if you have star with 0,8 m-Sun it stays on main sequence for 25000 milion years and that's close to 35000 - like us.

Less m-Sun means longer lifespan, right?

Homework Statement For the development of life time is needed. The period during which the star remains at the main sequence depends primarily upon its mass. Type stars, our sun "yellow dwarf" remain on the main sequence about 10 billion years. Weight is often measured in multiples of the mass...

Homework Statement What is the closest celestial object that has bound synchronous rotation with another object? Homework Equations - The Attempt at a Solution I am almost sure it's Moon.