Earth's polar axis was tilted in a similar way around 4.5 billion years ago when a Mars-size protoplanet, named Theia, smashed into our planet and created the moon. This is why we have different ...

Some PSRs haven't seen sunlight in billions of years, due to the slight tilt the Moon has on its axis. That's not news, but what's surprising is that these lightless voids could also be ...