When will the universe end ?

I think 20 billion years until the sun dies out

Explanation:

The universe will never end. Its not a thing like stars and planets and stuff, its the medium in which matter goes through. The problem with us humans is that we cant grasp concepts like infinity. Hence why we call pi an irrational number.

Explanation:

is this a psat question, if so do not cheat try your best.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )