Blue Sky -

Why is the Sun Yellow and the Sky Blue?

This video is very interesting because it will teach you on how we perceive electromagnetic waves when looking to the sky 😀


A Glimpse of the sun’s power II: How the rainbows are formed?

You found out how the auroras are formed. Now you will learn about rainbows.

Rainbows are not formed in the practical meaning of existence, i.e. they are not real. They belong to what we usually call optical illusions. Rainbows are caused by the reflection and refraction of light in water droplets. After this the light scatters into different colors because different colours have different wavelengths. This means that they will leave the water droplet at different angles hence making a “colour palette” (ROG. BIV). [1]

What is even more interesting is that the rainbows are full circles… Want to know more? Watch this two videos of SciShow!


As always I hope you learnt something new! 🙂 [2]


Minutephysics has just made a wonderful video explaining the origins of the acronym ROG. BIV. Watch it!

I’m going to categorize this under the week themes despite the fact that it doesn’t fulfill the requirements for it (i.e. it wasn’t posted during that time).

References and further reading.

[1] – Rainbow – Wiki

[2] – See the references in the descriptions of the videos (open the videos on youtube)

Set the controls for the heart of the Sun

This is my last article on the Sun theme. I learned a lot doing the researches and I’m happy with the final result, 6 posts (including this one) with interesting new “stuff” to share! I would like some feedback so comments are more than welcomed!

Set the controls for the heart of the Sun

As I was researching this week theme I revisited one TED talk that made me gain confidence and It’s one of the reasons why I’m here today sharing what I everyday learn. This TED talk was made by Taylor Wilson (the second most young person to develop a nuclear fusion reactor).

Nuclear fusion is the process in which two or more atomic nuclei collide at a very high-speed, they merge together and form a heavier nucleus (with more energy) this happens because when they join into one single entity they lose mass that turns in energy. [1] [2]

In the core of the Sun, nuclear fusions take place hence releasing energy in enormous proportions making photons that once on the outside of the sun are mostly in the range of infrared/visible light/ultraviolet. [3]

I continued looking for this amazing teenagers for making this post and one news stroke me, a british boy had surpass this deed. Jamie Edwards became the youngest teenager to build a nuclear fusion reactor with 13 yo he beaten the achievement of 14 yo Taylor. [4]

At the end of that report there’s an announcement of an exhibit at the Imperial College London labeled “Set the controls for the heart of the Sun”, what clearly refers to the nuclear fusion happening at the Sun’s core. [5]

A little more about nuclear fusion… Nuclear fusion is still in research time, but it might one day get to another degree, the degree of supplying abundant and clean energy for all the planet. What is good for this source of energy is that it is much safer than the nuclear power plant energy created (nuclear fission) because it produces no high-level radioactive waste so It will not have the risk of disaster like the one in Chernobyl. [6]

A step to the future: A US$50 bilion project (building costs in July 2014) initiated in 2007 by 6 entities together (China, United States, Japan, European Union, India and South Korea) called ITER aims to create the first fusion power plant. [7]

Good News: Nowadays an experiment made in US changed the idea held that it took more energy for igniting fuel than the energy produced. (February 2014) [8]

Pink Floyd and the Sun

Pink Floyd, for those who never heard of them, are an English rock band formed in London in 1965. Well I could talk more about them but I guess that music, more than words, expresses their path and singularity. [9] “Set the controls for the heart of the Sun” is a track from their second album A Saucerful of Secrets released in 1968 it deploys a psychedelic rock music, paced and full of spiritual force.

I strongly recommend you to listen this track…

In this manner I say “au revoir” and get ready for the next week theme…

References and further reading.

[1] – Nuclear fusion – Wiki

[2] – (audiovisual reference) Nuclear fusion – elearning

[3] – The Sun’s Structure and Nuclear Fusion – earthguide & see  “References and further reading” on this post

[4] – British schoolboy,13, becomes youngest to build nuclear fusion reactor – the telegraph

[5] – Set the controls for the heart of the Sun – CIFS’ Royal Society Summer Science Exhibit 2014

[6] – Chernobyl disaster – Wiki

[7]  – ITER & (audiovisual reference) ITER – in five minutes

[8] – Big leap for fusion: more energy produced that spent igniting fuel – arstechnica

[9] – Pink Floyd – Wiki & Pink Floyd Official Site

Documentaries “The Sun”

Sun contains 99.86% of the mass in the Solar System

Isn’t that amazing. Who would tell that 99.86%, everything else (rocks, planets, dust) are just tiny, tiny, tiny, tiny parts of the Solar System.[1] Find this and other interesting stuff in the documentaries below…


Further reading and References:


How the sun sees you!

We are used to see in only one kind of electromagnetic waves, the visible light waves.[1]

What about ultraviolet waves, how do they make you look?

Sun has three different kinds of light that get into earth: infrared, ultraviolet and visible.[2] What we can only see is just the visible light. So have you ever thought about see in ultraviolet? How would you look?

Here is how the answer looks like…

References and further reading.

[1] – Introduction to the electromagnetic spectrum – Nasa

[2] – Sunlight – Wikipedia