# Watchers of the skies

- Institution: Gresham College
- Speaker: Professor Ian Morison
- Year: 2007
- Level: For everyone
- Language: English
- Subjects: Astronomy and space
- Source: [Gresham College](https://www.gresham.ac.uk/watch-now/watchers-skies)
- 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)

How our knowledge and understanding of the universe has increased over the centuries so that we now have a surprisingly accurate idea of its size, age and makeup - much of it unseen in the form of dark matter and dark energy!

## Lectures

1. [Watchers of the skies](https://invisiblenetwork.ai/learn/gresham/watchers-skies/71e080fd6a93) (YouTube)