Physical characteristics. Uranus is blue-green in color, as a result of the methane in its mostly hydrogen-helium atmosphere.
Uranus is slightly larger in diameter than its neighbor Neptune, yet smaller in mass. It is the second least dense planet; Saturn is the least dense of all. Uranus gets its blue-green color from methane gas in the atmosphere.
Atmosphere. Neptune's atmosphere is made up mostly of hydrogen and helium with just a little bit of methane. Neptune's neighbor Uranus is a blue-green color due to such atmospheric methane, but Neptune is a more vivid, brighter blue, so there must be an unknown component that causes the more intense color.
Mercury is of green color and reflects green rays.
Named GJ 504b, the planet is made of pink gas. It's similar to Jupiter, a giant gas planet in our own solar system. But GJ 504b is four times more massive. At 460°F, it's the temperature of a hot oven, and it's the planet's intense heat that causes it to glow.
The green color arises from emission line transitions in the ionized gas surrounding the dim, dying star. But green glows do exist in space, arising from heated gas.
The planets of the solar system are varied in their appearance. Mercury is slate gray while Venus is pearly white, Earth a vibrant blue, and Mars a dusky red. Even the gas giants are different, Neptune and Uranus an opaque blue, while Jupiter and Saturn are mostly beige with brilliant red-brown belts.
There are no green stars because the 'black-body spectrum' of stars, which describes the amount of light at each wavelength and depends on temperature, doesn't produce the same spectrum of colours as, for example, a rainbow.
Green might not be the color of stars, but it is a color clearly present in and around many galaxies. There are even “green pea” galaxies out there. Hanny's Voorwerp, identified in 2011, was the first of some 20-odd objects now known to be a ...
Green and purple stars do exist. The color of stars depends on their temperatures, and they emit radiation throughout the visible spectrum. But when a star emits peak radiation at a wavelength we define as green, it also emits radiation over the rest of the spectrum. Green is in the middle.
Dark stars are somewhat of a misnomer — they're not actually dark. In fact, they're likely some of the biggest and brightest stars in our universe. Yet no one has ever seen one.
Mars has a reddish color because of the iron oxides (rust) on its surface.
Darkest Planet Found: Coal-Black, It Reflects Almost No Light. The newfound gas-giant planet TrES-2b is black with a slight red glow, experts estimate.
Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time. Closer to the horizon, the sky fades to a lighter blue or white.
It is occasionally green, though not often. Let's begin...at the beginning. Color in the sky comes from particles; what meteorologists call aerosols that scatter the light. These can come from many sources-pollen, dust, smoke particles, pollutants.
We see rainbows on earth when the sun's rays interact with water droplets, refracting light towards whoever is looking at it. To see a rainbow in outer space is quite rare given the certain specific atmospheric conditions that have to all come together.
Mariner 4, which flew by Mars on July 14, 1965, found that Mars has an atmospheric pressure of only 1 to 2 percent of the Earth's. Temperatures on Mars average about -81 degrees F. However, temperatures range from around -220 degrees F. in the wintertime at the poles, to +70 degrees F.
Uranus holds the record for the coldest temperature ever measured in the Solar System: a very chilly -224℃. The temperature on Neptune is still very cold, of course – usually around -214℃ – but Uranus beats that. The reason why Uranus is so cold is nothing to do with its distance from the Sun.
You might see planets twinkling if you spot them low in the sky. That's because, in the direction of any horizon, you're looking through more atmosphere than when you look overhead. If you could see stars and planets from outer space, both would shine steadily.
“Pluto is shown in a rainbow of colors that distinguish the different regions on the planet. The left side of the planet is mostly blue-green with purple swirls, while the right side ranges from a vibrant yellow-green at the top to a reddish orange toward the bottom,” Nasa posted.
A "dead" star is one that has no more nuclear fusion going in it. When a star dies, it leaves some remnant behind. Depending on the mass of the star, the remnant can be a white dwarf, neutron star or a black hole. White dwarfs are what was once the core of a star.
“Blue Marble” true-color image of Earth taken from a single remote-sensing device-NASA's Moderate Resolution Imaging Spectroradiometer, or MODIS.
Small, old stars can be at room temperature ex: WISE 1828+2650, so you could touch the surface without getting burned. Any star you can see in the sky with the naked eye, however, would be hot enough to destroy your body instantaneously if you came anywhere near them.
Our Universe appears to be expanding and cooling, having originated some 13.8 billion years ago in a hot Big Bang. However, it's plausible that what we see from inside our Universe is simply the result of being inside a black hole that formed from some parent Universe.