It's clichéd but true: At NASA, every day is Earth Day. We don't just explore the far reaches of the universe; we spend a lot of time looking down at our home planet from space. Amazing things can be discovered from the perspective of orbit, and that's why NASA has over a dozen satellites whizzing over our heads right now. We study the oceans, land, atmosphere, ice and snow, climate change, air quality, solar effects, earthquakes, volcanoes, weather and even the Earth's gravitational field, and there are many more exciting missions planned for the future.

Today on the fortieth anniversary of Earth Day, take a moment to appreciate the majesty and beauty of our home planet with this video we put together.