Apollo 11 gave us the Rosetta Stone of our solar system's history.
Even 50 years after Apollo 11 landed on the moon.
Even in space, bureaucracy exists.
Short answer: Because we changed the definition of the word “planet” to better fit its meaning.
From the Popular Science archives.
And you thought this summer was hot
The traveller (maybe from another star) didn't stay long and it's moving away fast
So hot right now.
A sky full of super-Earths
You can basically read fanfiction about them
Three of them may be habitable
Water, water, everywhere (but especially around the poles)
And still has a hot core
Konstantin Batygin is one of the 10 most brilliant people of 2016
We've got exoplanets on exoplanets
Short answer: It depends who you ask
Scientists catch a Neptune-style orbiter by its very long tail
This year's missions to the outer solar system are set to shake up the planetary family tree
The finding is good news for the search for intelligent alien life
The ups and downs of our solar system's least explored planet
A new book showcases images from the forgotten Gemini mission, which taught NASA how to live and work in space
Throwing shade on Earth's telescopes
A look back at the spacecraft's greatest discoveries