U can see the center of the earth, bottom of the sea, or a random planet billions of miles away?

Bottom of the sea. A lot of gold laying down there.

All three sound like certain death, but the planet would require more scientific innovation, so even if it was a failure, the research gained would be immense.

When you say see, are you talking about being able to physically be there and explore? Or just see it from afar?

20,000 leagues under the sea lol

Random planet.

Sea

Planet

Planet