We are all connected; To each other, biologically. To the earth, chemically. To the rest of the universe atomically.
Aliens might be surprised to learn that in a cosmos with limitless starlight, humans kill for energy sources buried in the sand
I would request that my body in death be buried not cremated, so that the energy content contained within it gets returned to the earth, so that flora and fauna can dine upon it, just as I have dined upon flora and fauna during my lifetime
UV is bad for molecules because its high energy breaks the bonds between a molecule's constituent atoms. That's why UV is bad for you, too: it's always best to avoid things that decompose the molecules of your flesh.
If aliens did visit us, I'd be embarrassed to tell them we still dig fossil fuels from the ground as a source of energy.
In astrophysics, we care about how matter, motion and energy manifest in objects and phenomenon in the universe. Stars are born. They live out their lives. They die. Some of the ones that die explode. Our sun will not be one of those, but it will die. And it'll take Earth with us. So we make sure we have other destinations in mind when that happens. And I've got it on my calendar.
You know, there's black holes and what - could there be wormholes? Could - might there be a multi-verse? These are all fascinating frontiers. What is the nature of dark matter and dark energy? And what was around before the universe? And do we have access to higher dimensions?
A state of negative energy means that you are essentially getting something for nothing.
There are two ways you can receive energy from your environment: One is molecules bumping against you. That's the air. The other is radiative energy. That's what you're feeling from the sun. When they say "Get out of the sun, out of the heat," the air is the same temperature; it's just you're exposed to sunlight.
The chunks of comet Shoemaker-Levy 9 were so large, and were moving so fast, that each hit Jupiter with at least the equivalent energy of the dinosaur-killing collision between Earth and an asteroid 65 million years ago. Whatever damage Jupiter sustained, one thing is for sure: it's got no dinosaurs left.
If you get asteroids about a kilometer in size, those are large enough and carry enough energy into our system to disrupt transportation, communication, the food chains, and that can be a really bad day on Earth.
