# Harbingers of Doom?

- Institution: Gresham College
- Speaker: Professor Ian Morison
- Year: 2009
- Level: For everyone
- Language: English
- Subjects: Astronomy and space
- Source: [Gresham College](https://www.gresham.ac.uk/watch-now/harbingers-doom)
- Licence: [Educational use (Gresham College's terms)](https://www.gresham.ac.uk/terms-and-conditions)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Though a beautiful sight in our heavens, comets were once thought to be evil vapours burning up in our atmosphere. However, we now know that they have brought organic material and water to our planet Earth so helping to lay the foundations of life. But, equally, one could bring about the end of civilisation!

## Lectures

1. [Harbingers of Doom?](https://invisiblenetwork.ai/learn/gresham/harbingers-doom/ff8df253ea61) (YouTube)