What is rafract?

Are moon rocks radioactive? What does observing invole? Why does the cycle of seasons on earth always remain the same? Why is there changes in day length throughout the year? How does the sun affect the hydrosphere? What are the two features of the suns atmosphere? A sentence using the word scope? What was the date 51 weeks ago from today? When does space end? How did Apollo 11 get back home? What does a very bright star mean? Why does Helios threaten to go underground forever? When the sun in at the top where is the shadow? What is the name of the sun atmosphere? Why can some people see the future when dreaming? When the earth blocks the light of the sun on the moon what is it called? What is the earth's nearest celestial neighbor? What is a month that has two full moons? What important family saw the montgolfiers hot air balloon in September 1783? What does it means of sense of spatial immensity?