100 kilometres
A length of 100 kilometers (about 62 English miles), as a rough amount, is relatively common in measurements on Earth and for some astronomical objects. It is the altitude at which the FAI defines spaceflight to begin. To help compare orders of magnitude, this page lists lengths between 100 and 1,000 kilometres (105 and 106metres).
Distances shorter than 100 kilometres
Conversions
A distance of 100 kilometres is equal to about 62 miles (or 62.13711922 miles).
Human-defined scales and structures
10 micrometres
To help compare different orders of magnitude, this page lists lengths between 10−5m and 10−4 m (10 µm and 100 µm).
Notes
Podcasts:
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by Guided By Voices
E-5
by: Guided By VoicesPerfect birds sit on plastic bush
In my cubicle
I've been knowing this for some reason now
And anyday I expect the delivery truck
To bring me mine, the order is late
But still I wait for the starfire demon