How many pens do you need to get to the Moon Ballpoint pens can produce up to two miles of writing. As there are 238,855 miles to the moon from earth, it would require nearly half a million ballpoint pens to draw a straight line to our only natural satellite. That's a lot of pens!
Tell us what yours is? Yellow is in the middle spectrum of visible light, and thus works well for people with colour blindness. This is one of the biggest reasons why yellow is the most popular colour of fluorescent highlighter ink. As Chris Martin of Coldplay fame might say, “It’s all yellow”