37K views · 3.7K reactions | Our galaxy contains billions of other planets, but we know little about them. If we had the chance to study an exoplanet in greater detail, we could learn more about planetary evolution and habitability. Surprisingly, there is a nearby planet we could study that would not only teach us about our planet, but also about many exoplanets. | NASA Solar System Exploration | Facebook

Galaxies are concentrations of stars, gas, dust, and dark matter. They come in a variety of shapes and sizes. Some are fated to collide, like the Milky Way and Andromeda. Credit: NASA and J. Olmsted (STScI) | NASA's James Webb Space Telescope

325K views · 7.9K shares | When we talk about the enormity of the cosmos , it’s easy to toss out big numbers – but far more difficult to wrap our minds around just how large, how far, and how numerous celestial bodies really are. Join us for a cosmic journey to see the size of our Milky Way galaxy: https://go.nasa.gov/2UxkHIN | NASA - National Aeronautics and Space Administration | Facebook