4.1K views · 63 reactions | In the entire Milky Way Galaxy there could be as many as 40 billion Earth-sized planets orbiting its stars in the Goldilocks zone for life. | OER Project | Facebook

11K views · 308 reactions | You know the 8 planets, but did you know these other facts about our solar system? | National Geographic TV | Facebook

🌋 Could lava tubes hide signs of life on Mars? To find out, NASA researchers went deep beneath Hawai‘i’s volcanoes to study Earth’s own lava tubes – places where life survives in dark, extreme conditions. Join the expedition in our new documentary as astrobiologists test the technologies that will guide future NASA missions to detect and discover life beyond Earth. Don’t miss Our Alien Earth: Hawai’i, streaming now on NASA : https://go.nasa.gov/4sdN5vP | NASA Solar System Exploration