There was a time when the term “off-grid” conjured images of doomsday preppers or Ted Kaczynski. Today, off-grid is going mainstream, with numerous manufacturers offering equipment to provide the ...

This story is a collaboration with Biography.com. Few things seem as immutable than the Sun—after all, it’s been fusing hydrogen for five billion years, and it’ll keep on ticking for about five ...

To receive the same amount of starlight as Mars receives from our sun, a planet orbiting an M-type red dwarf would have to be positioned much closer to its star than Mercury is to the sun. Disclaimer: ...