I wonder why the sky is blue.

I wonder why the sky is blue.

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Investigating Rusting

Investigating Rusting

Aim: To investigate the factors that cause rusting in iron.

Method:
1. Lable six test tubes A-F and place in a test tube rack.
2. Test tube contents:
A= Iron nail and tap water
B= Iron nail and Saltwater
C= Iron nail and water +oil
D= Iron nail and Mg ribbon wrapped around it
E= Iron nail and water calcium chloride bung
F= Iron nail and nail polish

3. Leave the test tubes undisturbed for at least three days.

Stars

Stars

I wonder how many stars are on the Earth.On the Earth, there are about 10 million galaxies and in each galaxy is 10 billion stars so that means there 1,000,000,000,000,000,000,000 that 1billion trillion stars in the observable universe.


How many stars can we see?
There are only about 5,000 stars visible to the naked, average, human eye, MinutePhysics points out.

Is the sun a star?
The sun is classified as a G-type main-sequence star or G dwarf star, or more imprecisely, the sun — like other G-type stars — is white but appears yellow through Earth's atmosphere. Stars generally get bigger as they grow older.

What is the smallest star in the universe? How small?
The smallest stars around are the tiny red dwarfs. the red dwarf has 7.5% the mass of the Sun. What is the biggest star? How big?
The biggest star in the universe is called VY Canis Majoris and it's 987.9 million km. It is one of the largest stars discovered so far and is also one of the most luminous of its type.