During a sunset, the light from the sun travels a long path through the atmosphere and at the point it reaches you, a blue light is mostly dispersed. That leaves you observing the other colors of the visible light spectrum in the evening sky.
The higher the temperature the faster particles of matter moves. A color of the heat emerges when parts of a hot matter release its thermal vibration energy as photons, which is basically a particle of light. An orange hues of heated objects are between ~1,100 °C (2,000 °F) and ~1,200 °C (2,200 °F).
Based on their mass every star has a different pressure, bigger the mass – bigger the pressure, bigger the pressure – the higher temperature the star has. The Sun is a type G main-sequence star, which means yellow hue due to temperature on surface ranging between ~5.000 C – 5.700 C(5.300 K – 6.000 K). Lower mass stars shifts more to a red hue and higher mass stars to a blue.
Standard way to measure the mass of the star is to use solar mass unit(M☉), you don’t have to be a genius to understand that the Sun has 1M☉, which is ~2.000.000.000.000.000.000.000.000.000.000 kg 🙂
Too much of sunlight might be deadly even to plants. To protect themselves from it, they evolved to reflect the most abundant light waves from the sun – green.
Copper, or metallic alloys containing copper, tend to turn green in time. It happens due to chemical reaction called oxidation between copper and oxygen in the air, and if exposed to high moisture, the reaction will occur even faster. Oxidation of copper then triggers other reaction, which results in copper carbonate formation – substance with a blue/green color. Unlike rust on iron, this doesn’t weaken the material and actually even forms a protective layer from further oxidation.
While small amouts of water might look colorless, due to it’s molecular structure water has a blue hue. Particles, microbes and light reflection can give it a variety of tones as well.
Blue light travels as shorter smaller waves than other visible light, therefore it scatters more easily in our atmosphere and makes earth’s sky look blue.
A snow is white, therefore it reflects every color. In a sunny day shadows on it appears blue as the only source of light is blue from the sky.
If there was an evolutionary advantage to purple plants, we would be surrounded by them and purple leaves wouldn’t be so rare. But there might a difference when we are talking about purple flowers. Some studies show that pollinators prefer purple color, which increase the chances for pollination.