4K views · 182 reactions | 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 | Facebook

3M views · 106K reactions | Ever wonder how far away those stars in the night sky are? 樂 Our Sun’s nearest neighbor star is about 4 light-years away … our galaxy is over 100,000 light-years wide! But what does that even mean? Check out this Tumblr for a primer: https://nasa.tumblr.com/post/184153458369/how-big-is-our-galaxy-the-milky-way | NASA Universe | Facebook