Earth's magnetic field shields us from the solar wind. When some of it slips in at the poles, the sky lights up as auroras.

Saturn is less dense than water. Given a big enough bathtub, it would float.

A red supergiant so huge that if it replaced the Sun, its surface would reach past the orbit of Mars.

A dying Sun-like star shedding its outer layers. Our own Sun will look like this in about 5 billion years.

The closest big stellar nursery, visible to the naked eye as the fuzzy middle 'star' of Orion's sword.

The supermassive black hole at the heart of the Milky Way, about 4 million times the mass of the Sun.