The smallest, most dense planet will begin its 5.5 hour pass across the sun tomorrow morning at 7:35 a.m. EST.
We owe our life...and much more...to our favorite star in the sky.
Take us there, Lucy.
The trailblazing Soviet-era cosmonaut was 85.
And Jupiter is now in the second spot.
And get this: The thing could be smaller than a soccer ball.
From Venus to Pluto, here's a ranking of the 10 coolest volcanoes in the solar system.
A giant eyeball, basically.
Not that there was ever any question. But hey, would you look at those rings?
It's on a mission to reveal the sun's long-held secrets.
You might also know them by their other name: neutrinos.
It looks a bit different from the pale blue dot.
Scientists still don't quite understand. But they're getting closer.
We never know what that thing is doing up there.
Get out your telescopes.
And an amateur astronomer caught it on camera.
From auroras to solar burps, there's a lot a mini-Sun can teach scientists.
Aurora Borealis and the Aurora Australis are the Earth's greatest natural light shows—here's how they work.