KnitYourOwnSpaceship
KnitYourOwnSpaceship t1_iu5pqof wrote
Reply to comment by blow_up_the_outside in ELI5: How is every point the the universe the centre of the universe? by Head-Plankton-7799
> Where that edge is lies our cosmic horizon.
> So our observable universe has a size, and that is 13.8 billion light years (the age of the universe) in every direction from here.
Nitpick: because the universe is expanding, the size of the observable universe is 93 billion light-years, not 13.8
KnitYourOwnSpaceship t1_j29r6jk wrote
Reply to comment by SirDuke6 in ELI5: Why does putting one foot out from under the blankets bring so much relief of heat while laying in bed? by SirDuke6
I've sondered the same, and my theory is that you're also disturbing the air under the blanket when you move your foot. Sticking part of yourself outside the blanket gives the chance for colder air from the room to move under the blanket. It's not a complete change of all the trapped air, but enough to make a difference pretty quickly.