Question: why is there a solo sistum?

Lewis Wright answered on 13 Mar 2017:

I googled ‘solo sistum’ and it suggested ‘solar system’, so I will answer that – if that’s not what you meant, please ask again!

The Solar System exists because the Sun exists. The planets formed because dusk was trapped in orbit around the sun, and that got collected up to form planets. (Think of Saturn as the Sun, and Saturns rings as dust orbiting the sun – eventually it will be drawn together under gravity, making planets)

The sun could begin burning because the hydrogen gas that it is made of was also attracted together under gravity, and the heat formed by the pressure it produced kick-started a fusion reaction.