Royal Institution on Instagram: "If interplanetary tourism ever becomes a thing, Venus definitely won't be a popular holiday destination. Carl Sagan described why the surface of the planet isn't somewhere you'd ever want to visit. Watch the full 1977 series with Carl Sagan at the 🔗 on our profile: @ri_science 🚀 For even more mind-blowing space facts, don't miss the 2025 Christmas Lectures, supported by @cgi_uk, 28, 29 and 30 December on BBC Four and iPlayer."

Galaxies on Instagram: "A day on each planet is defined by how long it takes the planet to rotate once on its axis, and they vary dramatically across the solar system. Mercury spins slowly, so its day lasts about 59 Earth days. Venus rotates even more slowly and in the opposite direction, giving it the longest day of all—243 Earth days. Earth takes 24 hours. Mars rotates in about 24 hours and 37 minutes, making its day very close to ours. Jupiter spins the fastest, completing a rotation in just