Simplify the following text for a Grade 12 native English-speaking person.
Original: The Bond albedo , named after the American astronomer George Phillips Bond ( 1825 â `` 1865 ) , who originally proposed it , is the fraction of power in the total electromagnetic radiation incident on an astronomical body that is scattered back out into space .
Simplified: The Bond albedo is the fraction of power in the total electromagnetic radiation incident on an astronomical body that is scattered back out into space .