Transcript

NARRATOR:

Converting angular size to actual size Important note: for this calculation to work, the angle must be converted from degrees, minutes and seconds to radians, where 1 radian equals 57 degrees.

So 1 degree equals 1 over 57 radians

Angular size equals actual size over distance

Actual size equals distance multiplied by angular size

The Orion Nebula is 1 degree across equalling 1 over 57 radians

The Orion Nebula is 15.2 thousand million million kilometres away

The actual size of the Orion Nebula is 15.2 thousand million million multiplied by 1 over 57 kilometres

The Orion Nebula is 267 million million kilometres or 167 million million miles across.

So, very big!