0:15:04 > 0:15:06Welcome to Science Fiction -
0:15:06 > 0:15:10the TV show which stamps out superstitions...
0:15:10 > 0:15:14Using hard scientific evidence. Oh, look, a leprechaun!
0:15:14 > 0:15:17BUD-E, what's today's question, please?
0:15:17 > 0:15:21Today's question is from Walter in Gibraltar.
0:15:23 > 0:15:27Sunlight is energy, which travels in waves all from the sun
0:15:27 > 0:15:30and helps us to see the world around us.
0:15:30 > 0:15:34This light is made up of an entire spectrum of colour, like a rainbow.
0:15:34 > 0:15:38Red, orange, yellow, pink, Sleepy, Happy, Dopey...
0:15:38 > 0:15:43Each colour within the spectrum has a wavelength of different size.
0:15:43 > 0:15:47Wavelength - is that how long a person can keep waiting for?
0:15:47 > 0:15:50For example, orange and red wavelengths are quite long.
0:15:50 > 0:15:52Violet and blue are short.
0:15:52 > 0:15:54Fair enough. Everyone's different.
0:15:54 > 0:15:58As the sun's light approaches Earth, it hits our atmosphere
0:15:58 > 0:16:01and the waves scatter in different directions.
0:16:01 > 0:16:04The first to get scattered are the short ones.
0:16:04 > 0:16:07The blue ones. That's why the sky is blue.
0:16:07 > 0:16:10Come here, Doctor. The sky isn't always blue.
0:16:10 > 0:16:15Well, at sunset, the light has more atmosphere to travel through.
0:16:15 > 0:16:19More waves get scattered, including orange and red ones.
0:16:19 > 0:16:22I love a good sunset, I do. It's very rosemantic.
0:16:22 > 0:16:27So the sky being blue is nothing to do with reflecting the sea.
0:16:27 > 0:16:31So, that's just a load of old science fiction.
0:16:31 > 0:16:33# Science fiction. #
0:16:33 > 0:16:36When I was a small boy, my mammy told me
0:16:36 > 0:16:39don't stare into the sun or I'll go stupid.
0:16:39 > 0:16:41But I still did.