Question

Which of these scientists defined the period of a planet?

Answer 1

Explanation:

GALILEO

.......AND COPERNICUS

Answer 2

☆$\red {HELLO\:DEAR}$☆

• UCLA astronomer and planetary scientist Jean-Luc Margot says the answer is yes.
• The current definition was decreed by the International Astronomical Union just nine years ago.

☆$\green {VISHU\:PANDAT}$☆

☆$\blue {FOLLOW\:ME}$☆