Does sound pass in and/or out of the hut?

It doesn’t say anything about sound, and I’m not familiar with any other force effects that impact sound. So it looks to me like it’s clearly in the realm of DM rulings.

In my game, I rule that sound is not affected by Leomund’s Tiny Hut. My rule of thumb is to look at the wording of the rules, and to not affect anything else unless it violates my interpretation of common sense and immersion in the game.

But I could see other tables ruling either that sound is blocked entirely, or that only those on the inside could hear outside noises, but not vice-versa. Both of those rulings could also be justified, I think.

Lol whyd they change the name? I think adding the person who made it at the beginning gives it a nice bit of history 

If I had enemies inside a Tiny Hut, I'd build a HUGE bonfire around and on top of it and keep it burning until the spell expired.

There are 2 versions of the spells with Names in them usually. Most of the Tasha's <BLAHBLAHBLAH> spells also have the same thing. For DMs that dont want those 'NPC's in their worlds i would assume.

Quote from baus

1. The atmosphere inside is impervious to outside elements, including natural and magical, and is comfortable (fresh/breathable air implied here).

5e explicitly *does not* allow implications. Spells do only precisely what they day they do. That's a point stressed many times across many different points, by the designers themselves as well as the advocates.

Here, it specifies that "[t]he *atmosphere* inside the space is comfortable and dry, *regardless of the weather outside*". Air literally is the atmosphere, but the Spell doesn't say it ignores the atmosphere nor that it creates one, only that it becomes dry and comfortable. If there is no atmosphere, it does not create its own, or the Spell would say it does.

Can a creature in the ethereal plane be able to interact with a character inside a Tiny Hut on the material plane?

Spells with fancy copyright names are in the PHB.  The same spell without the fancy copyright name is in the Basic Rules.

Quote from NikoliVolkoff >>

There are 2 versions of the spells with Names in them usually. Most of the Tasha's <BLAHBLAHBLAH> spells also have the same thing. For DMs that dont want those 'NPC's in their worlds i would assume.

 I believe the spellcasters are residents of Greyhawk specifically. I run Eberron mainly, where these folks don't exist. I can cause confusion with my newer or less committed players.

Today, I learned that the "Northern Hemisphere" includes not just the surface of the Earth, but a circular disc cutting through the equator.

Very weird that so many people (the Sage included) are projecting a meaning on the word "hemisphere" that isn't there.

Quote from TimStellmach >>

Today, I learned that the "Northern Hemisphere" includes not just the surface of the Earth, but a circular disc cutting through the equator.

Very weird that so many people (the Sage included) are projecting a meaning on the word "hemisphere" that isn't there.

 The Northern Hemisphere is all of the northern half of the Earth, which, yes, includes that circular disc. Hemisphere literally means "Half-Sphere". The point of contention has NOTHING to do with "Hemisphere" is has to do with the word "Dome" which is what's used to describe the shape of the wall. A dome CAN be a hollow hemisphere, but it can also be a bowl.

In other words, your obvious sarcasm wasn't justified.

Monsters can dig under it and things would fall out of it. Even if it has a floor, that floor is passable for the creatures and objects inside it.

This, is supprisingly not wrong. But that would depend on the DM. Due to the fact it says they 'can' pass through

A hemisphere includes a bottom as it is a slice down the middle of an orb.  It has a bottom to it

"The spell ends if you leave its area" ... so the Wizard goes outside, cause he/she had do to some toilet buissness and it's the end of the hut? 

Yes, cuz Wizards aren't allowed to poop in private.

Step 1) Scout out where BBEG is camped.

Step 2) Have the beefiest party members screen your caster and the party face engage the BBEG in a debate or monologue.

Step 3) Have your caster discreetly cast the Tiny Hut in the minute before combat starts while BBEG is talking.

Step 4) You now have a forward bunker to shoot arrows, jab spears from, and taunt securely. Or have your other party members pop out, dish damage spells, retreat back, rogues to sneak attack from within because of obscurity. Just gotta keep the one who cast the bubble safe inside, twiddling their thumbs.

Step 5) Profit

Question: would nonmagical ammunition fired from within the hut by a magical weapon, say regular arrows fired from a +1 magical shortbow still have the +1 to hit/+1 to damage rider? I think of the "+1" weapons as just packing extra punch, so I figure the conservation of momentum would hold once it's loosed. 

surprised that this is evocation

One question I have is if you use "water walk" to stand on top of a liquid and then cast "tiny hut" would it create a sphere of force that extends below the surface of the liquid or would it create a flat barrier of force right below your feet or would be vulnerable to attacks from below?