What is a helicorder?

How did the summer solstice begin? What color is ultra-violet? Why is red an easier color on your eyes when looking for stars? Is there a difference between into dust and unto dust? What never changes when two or more objects collide? What part of the sun does the sunlight received on earth come from? Is the sun the only star in milky way galaxy? What is the world's largest clock? How can you use luminous in a sentence? What are the names of the two spacecraft memorials? What is the name of exploding stars? How far has Hubble traveled into space? Does the name Kyran mean beam of light? What are the coordinates for the color Raspberry Rose? Why Skylab fell on earth? How big is the PS10 solar Power tower? Who was the first us astronaut? What is the perfect match for the sun sign Leo? In the movie The Hitchhikers Guide to the Galaxy what is the ultimate question of life the universe and everything? What is the inferred age of your solar system in million of years?