Forty-five years ago today, Apollo 11 launched from Kennedy Space Center on humanity's first crewed mission to the surface of the moon. This view of Earth was captured from Apollo soon after translunar injection, just as the spacecraft was breaking away from our planet's orbit.
Humans haven't been back to the moon since 1972, but that hasn't prevented us from pursuing even deeper exploration of space. Elon Musk, CEO of SpaceX, wants people on Mars within 10–12 years. According to NASA, "the first humans who will step foot on Mars are walking the Earth today." But will Carl Sagan's message to future Martian explorers actually be listened to by human visitors to Mars, within our lifetimes? The Agency sounds pretty confident. From a recently posted manifesto titled "NASA's Next Giant Leap":