The mighty sun is our close source of light, if it goes we go..scary isn't it. There are about 200 billions suns in our galaxy alone, that is almost to say there as many suns as the sand in the desert. the numbers are just humongous and that should give you a reflection on your daily life. Unfortunately or fortunately the distance between us and other SUN bodies are hundrend thousands, some millions, and some billions of light years away. Only light can travel that distance.
Knowing that fact is enough to send a chill down my spine. if our sun can swallow million earth size bodies and out there there are sun that are so humongous that they can swallow million bodies of our sun size. And if you think that is big there are even bigger objects in the universe.
To travel at the speed of light you have to be massless otherwise the equation E=mc2 will hold you back. Why? because for every kg will need astronomical amount of energy that does not exist. So it is wishful thinking about travelling at the speed of light.
so here i use the word PHOTON to mean a quanta of light.. in plain english a particle of light with well defined energy.
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