Wunder @WunderLearn

Watch the whole story: youtu.be/RmoZIWet3Yc Music: "Long Note Four" by Kevin MacLeod (incompetech.com), CC BY 4.0

Titan's air is about four times denser than Earth's and its gravity is weaker than the Moon's, so flying there takes far less effort. NASA's Dragonfly rotorcraft is due to arrive in 2034.

Full film on YouTube: youtu.be/RmoZIWet3Yc Music: "Long Note Four" by Kevin MacLeod (incompetech.com), CC BY 4.0

On Titan, methane does what water does on Earth: it forms clouds, falls as rain, carves rivers and fills seas. Its largest sea, Kraken Mare, is about the size of California.

The full film: youtu.be/RmoZIWet3Yc Music: "Long Note Four" by Kevin MacLeod (incompetech.com), CC BY 4.0

In January 2005 the Huygens probe parachuted through Titan's orange smog for 2 hours 27 minutes and landed on the surface. It is still the only landing ever made in the outer solar system.

Watch the full film: youtube.com/@wunderlearning Music: "Long Note Four" by Kevin MacLeod (incompetech.com), CC BY 4.0

Titan, Saturn's largest moon, has clouds, rain, rivers and seas, but they're made of methane, not water. It's the only other world we know where liquid rains down and pools on the surface.

Watch the whole story: youtu.be/O0Tr46awTw8 Music: "Long Note Two" by Kevin MacLeod (incompetech.com), CC BY 4.0

Mars has misled us before. In 1976 Viking 1 found no organic molecules, and the possible fossils reported in a Martian meteorite in 1996 turned out to be features that can form without life.

Full film on YouTube: youtu.be/O0Tr46awTw8 Music: "Long Note Two" by Kevin MacLeod (incompetech.com), CC BY 4.0

Mars lost its global magnetic field long ago, and the solar wind is still stripping away its air. NASA's MAVEN spacecraft measured the loss: about 100 grams every second.

The full film: youtu.be/O0Tr46awTw8 Music: "Long Note Two" by Kevin MacLeod (incompetech.com), CC BY 4.0

NASA's Perseverance rover found a rock on Mars covered in "leopard spots" made of two minerals that, on Earth, often form around microbes and decaying organic matter. NASA calls it a potential biosignature.

Watch the full film: youtu.be/O0Tr46awTw8 Music: "Long Note Two" by Kevin MacLeod (incompetech.com), CC BY 4.0

About four billion years ago, Mars had rivers, lakes and maybe an ocean. Now a rock found by NASA's Perseverance rover has brought us closer than ever to knowing whether anything lived there.

Watch the full film: youtu.be/GEWjsTrLyYY Music: "Long Note Four" by Kevin MacLeod (incompetech.com), CC BY 4.0

In 1964, Penzias and Wilson heard a faint hiss in a New Jersey radio antenna. It was leftover light from the Big Bang, and it later earned a Nobel Prize.

Watch the full film: youtu.be/GEWjsTrLyYY Music: "Long Note Four" by Kevin MacLeod (incompetech.com), CC BY 4.0

The Big Bang made matter and antimatter in almost equal amounts, and nearly all of it destroyed itself. Every star, planet and person is made of the small surplus left over.