What is out there, and is any of it looking back?
Exoplanets, black holes, dark matter, the origin of the universe, and the search for company.
This region in profile
- Surface
- 1 question
- Shallows
- 7 questions
- Deep
- 7 questions
- Abyss
- 6 questions
- Unknown
- 1 question
Ways through
Two routes, each starting somewhere different. Nothing here is a prerequisite for anything else, and every question stands on its own. A stop opened from a route carries it: the foot of the question offers the next one.
Outward
Start where the Sun’s wind gives out and keep going until the question stops being about distance.
Take this routeThe whole history
The universe in order, from the first three minutes to whether there are last ones.
Take this route
Inspect the ocean and its routes
Every question here
- Where did gold come from?surface
- How many planets are there?shallows
- Is there another planet in the solar system?shallows
- What happened in the first three minutes?shallows
- What is left when a star dies?shallows
- Where did Earth’s water come from?shallows
- Where did the Moon come from?shallows
- Where does the solar system end?shallows
- How will the universe end?deep
- Is anyone else out there?deep
- What is most of the universe made of?deep
- What is sending millisecond radio bursts across the universe?deep
- Where do cosmic rays come from?deep
- Where does the observable universe end?deep
- Why do two good measurements of the universe disagree?deep
- Is the universe infinite?abyss
- What happens inside a black hole?abyss
- What is the universe expanding into?abyss
- What was the universe like before there were stars?abyss
- Where does information go in a black hole?abyss
- Why is there more matter than antimatter?abyss
- Why is there anything at all?unknown