For debris objects bigger than 10 cm the data come from the US Space Surveillance Catalogue.
The information about debris objects smaller than 10 cm is based on a statistical model by ESA.
Number of space debris objects in orbit:
Bigger than 1m: 5 400 objects
Bigger than 10 cm: 34 000 objects (among them are only 2 000 active satellites)
Bigger than 1cm: 900 000 objects
Bigger than 1mm: 130 000 000 objects
Colour code:
Red: satellites (functional or dysfunctional)
Yellow: rocket bodies
Green: mission related objects (covers, caps, adapters, etc.)
Blue: fragments
More information: www.esa.int/debris
