What is the temperature of the arcturus?

What day of the week was 12th July 1963? Is the earth's orbit around t he sun highly elliptical or almost circular? How does an armillary work? Is it true that the ionosphere is the lower layer of the thermosphere? Would the gravity affect the plants on the moon? How much would it cost to get rid of the asteroid belt? How does the solar eclipse damage your eyes and what precautions should be taken to protect them? Why is it necessary to detect radiation from space in more than just the visible range? Is plasma cloudy? How long did Apollo 11 stay on the moon's surface during its historic 1969 mission? What is the object in the sky that shines brightly at night? How is the moon able to provide light to the earth? Where would you find the peridot? Why does the moon appear upside down? Is night vision UV vision? Why has NASA sent probes instead of manned missions to places like moon and mars? What is the nearest planet to Mercury? When did Apollo 17 land on the moon? Why is consciousness hard to study? What happens if you put an egg in space?