*Astronomy not physics How long does it take a message to travel from Earth at Pluto at its average distance from Earth (about 5.9
billion km)?

What are similarities and differences between refraction, reflection, diffraction and absorption?

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good