Is lava a natural source of light?

What is it called when you only have one line of symmetry? What were the wind speeds of the 1951 1956 Valetta tornado? If you look you cannot see me And if you see me you cannot see anything else I can make anything you want happen but later everything goes back to normal What am I? Which century is 1966 ad? Is Jack going to come and be in Doctor Who again? Plasma makes up about how much of the visible universe? What is galactiland? What two factors determine how bright a star looks like from earth? What powers did Andromeda have? What time of the year is the northern hemisphere exposed to vertical rays of the sun? Why was the Apollo 13 mission so significant? What does the use of chiaroscuro rely to? Is the hubble telescope unmanned? When was argon first discovered? Why did astronauts bring an oxygen tank to the moon? How will the winds of blowing out of a pressure system in the northern hemisphere and southern hemisphere blow? The part of a shadow that surronds the darkest part? Why do diagrams and illustration show one side of the heart as red and the other side as blue? Why don't women need to wear a watch? What is the hottest planet in the galaxy?