there's no way you could survive the heat. if you stepped outside for just one second it would be like stepping in an oven. only hotter the blue sun would instantly burn all the tissues in your body to ashes. and maybe even your bones.
Around stars hotter and bluer than our sun, plants would tend to absorb blue light and could look green to yellow to red. Around cooler stars such as red dwarfs, planets receive less visible light, so plants might try to absorb as much of it as possible, making them look black.
Our Sun is classified as a yellow dwarf and is very much an average mid range star with a surface temperature of about 6000ºC. Blue or even blue/green stars are very hot up to 50,000ºC and are normally giant young stars which are very active or even 'hyper-active'. They are all young because they don't live very long.
What if Earth had a red sun? There's two types of 'red' suns, a red dwarf and a red giant. A red dwarf is at least 90% less massive and gives off far less light, so temperatures would plummet and our oceans would freeze over, though now insolated from the ocean underneath would remain liquid a very long time.
The first thing we would notice is that the sky would go dark. The last rays of sunlight would reach Earth about eight minutes after the sun's disappearance, as that is how long it takes for light to travel from the sun to Earth. After that, we would only see the faint light of stars and planets.
Sunlight, or visible light, is made of all the rainbow colors: red, orange, yellow, green, blue, indigo, and violet.
Scientists are still debating whether or not our planet will be engulfed, or whether it will orbit dangerously close to the red giant sun. Either way, life as we know it on Earth will cease to exist. In fact, surface life on our planet will likely be wiped out long before the sun turns into a red giant.
Will the Sun become a black hole? No, it's too small for that! The Sun would need to be about 20 times more massive to end its life as a black hole.
Although a red giant's surface is not particularly hot, between 4,000 (2,204 degrees Celsius) and 5,800 degrees Fahrenheit (3,204 degrees Celsius), its interior could be vastly hotter than the Sun.
Contrary to popular belief, the Solar System would not be sucked in: a solar-mass black hole would exert no more gravitational pull than our Sun. As this computer simulation shows, the planets would actually continue on in their orbits as if nothing had happened.
This radiation keeps the void of space at 2.7 K, or -454 degrees Fahrenheit. This is cold by human standards, however, it is still warm enough to provide energy. A black hole can be massive enough to attract a large amount of this background radiation.
If our Sun was suddenly replaced with a black hole of the same mass, Earth's orbit around the Sun would be unchanged. Of course, Earth's temperature would change, and there would be no solar wind or solar magnetic storms affecting us. To be "sucked" into a black hole, one has to cross inside the Schwarzschild radius.
As a result, astrobiologists have suggested that photosynthetic plants on worlds orbiting lone red dwarfs could take on hues of red, blue, yellow, purple, or even grayish-black to best absorb the starlight. (See "Distant Planets Could Have Plants of 'Alien' Colors.")
Did you know that blue is the rarest flower color? Brandon George, graduate student in Public Garden Leadership at Cornell University, takes an in-depth talk on the color blue, why it is so rare in the plant world, and some tips for displaying it in a garden.
All of Earth would be in permanent darkness; the air and oceans would retain warmth for some time, but all life would eventually freeze to death.
With no sunlight, photosynthesis would stop, but that would only kill some of the plants—there are some larger trees that can survive for decades without it. Within a few days, however, the temperatures would begin to drop, and any humans left on the planet's surface would die soon after.
A hypernova (alternatively called a collapsar) is a very energetic supernova thought to result from an extreme core-collapse scenario. In this case a massive star (>30 solar masses) collapses to form a rotating black hole emitting twin energetic jets and surrounded by an accretion disk.
The possibility that a black hole could actually impact Earth may seem straight out of science fiction, but the reality is that microscopic primordial black holes could actually hit Earth. If one did, it wouldn't just impact like an asteroid, it'd pass straight through the entire Earth and exit the other side.
Just as our planet existed for over 4 billion years before humans appeared, it will last for another 4 billion to 5 billion years, long after it becomes uninhabitable for humans.
It still has about 5,000,000,000—five billion—years to go. When those five billion years are up, the Sun will become a red giant.
1- The colour red is connected with the heart, the centre of love and passion. The heart is frequently represented as a brilliant red symbol, and this link has contributed to red being a powerful symbol of love. 2- Because of its link with desire and passion, red is the colour of love.
The other colours pass through the Earth's atmosphere to reach us, but because of the great abundance of blue light wavelengths, our eyes see the sky as blue. Technically, the short wavelengths that scatter across the sky correspond to the colours blue and violet, making the real colour of the sky a bluish purple.
The water is in fact not colorless; even pure water is not colorless, but has a slight blue tint to it, best seen when looking through a long column of water. The blueness in water is not caused by the scattering of light, which is responsible for the sky being blue.