Mercury seems to be a somewhat uniform grey with splotches of brightness variance. MESSENGER's sensitive cameras, on the other hand, contain filters that isolate distinct hues, and when combined and amplified, they display minor color variations on the planet's face. These colors come from minerals in the surface material. For example, iron oxide produces red areas, and black-colored carbon absorbs light and appears in images as dark spots.
Over time, solar radiation can break down organic molecules, which are then removed by rain or blown away by wind. This leaves behind any metals inside the molecule- such as mercury- which can then be re-deposited back into the earth's crust through different processes. One process is called "weathering", which means physical and chemical changes to a rock caused by water, ice, wind, heat, and chemicals. This can lead to the release of metals like mercury into nearby waters or soil. Another process is called "erosional smoothing" which means that new material is exposed when old landforms are worn away by wind or water. This new material will usually have something added to it - such as dirt or rocks - that came from elsewhere. Erosion plays a major role in creating new habitat for plants and animals!
When astronauts walk on Mars, they are able to see evidence of past or present water activity.
Mercury is green and reflects green light. Jupiter is an orange-yellow planet that mostly reflects blue rays of the spectrum. Venus is thought to be pure white, yet it also reflects spectrum indigo rays. Saturn is dark in hue and reflects the sun's violet light. Uranus is gray and absorbs most of the light that reaches it. Neptune is blue.
Earth is black because it absorbs most of the light that reaches it. A small fraction of sunlight makes it through Earth's atmosphere and reaches the ground. Most of this light is reflected back into space by clouds and earth's surface. Oceans absorb some light too but not much. So on average, earth is black.
Other objects in our solar system are mostly made of ice or gas so they reflect light too. The only exception is Pluto which is a dwarf planet made of rock and ice. It doesn't reflect much light at all because it's covered in nitrogen ice clouds that block most of the sun.
In conclusion, the planets in our solar system are mostly dark because they're made of rock and ice.
Mercury's surface is a shattered and deformed landscape. Mariner 10 delivered us photographs of roughly half of the planet, and MESSENGER is doing everything it can to complete the picture, but everything points to a bleak terrain that was never meant to be anything other than dismal. It seems that most of Mercury's original water has been lost to space over time, leaving behind an arid world with very few places where life could possibly exist.
The only areas where anything might be found now are deep within the planet itself. Geologists believe that under the extreme pressure and heat generated by its own core, mercury melts into a liquid ocean that permeates the entire planet. This may well have been the case when our solar system was first forming, but today's conditions are quite different. The ocean probably doesn't reach the surface because much of the planet is covered in ice sheets, and even if there were no ice, the intense radiation would vaporize any water that did make it to the surface.
But even if we did find evidence for life beneath the ice, it wouldn't necessarily mean that it came from Earth. Other planets have had significant changes to their surfaces through geologic processes not related to life (such as volcanism), so this by itself isn't proof that they're inhabited.
The best chance of finding evidence for past or present life on Mercury would be in one of its many craters.
The wavelengths of light emitted by Mercury are 183.9, 253.7, 312-313, 365-366, 405-408, 436, 546, and 577-579nm. As a result, it has a complex, discrete spectrum. You may make it monochromatic by employing a monochromator attenuator to block all but one wavelength, often the 436nm or 546nm lines. However, most instruments have filters that can be used for this purpose.
Mercury light is polychromatic. That means it contains bands of colors across the spectrum. The color of mercury light depends on the type of lamp used to produce it. Colorless mercury vapor produces white light; colored lamps produce light within specific regions of the spectrum. To separate out particular colors, you need an optical filter. Optical filters are thin sheets of glass or plastic with holes cut into them. Each hole allows only certain wavelengths of light through. By combining several filters with different band gaps (the width of their absorption edges), you can reduce mercury light to any desired spectral range from ultra-violet to near-infrared.
In addition to being polychromatic, mercury light is also broad-spectrum. This means that it carries energy over a wide range of frequencies, which is why it is dangerous if not handled properly. If not extinguished properly, it can cause skin burns and eye damage. Monochromatic light is much less harmful as it emits radiation only at a single frequency.
Mercury's sky would be black during the day, not blue, since the planet has almost no atmosphere to disperse the sun's light. At night, however, with no clouds or brightness from other stars to compete with, its dark surface would reflect back all the sunlight coming from Earth, making it appear bright enough to see from deep within our own planet's shadow.
The sky on Mercury is actually red in color, due to the presence of iron oxide particles in its soil. These particles act as tiny mirrors that bounce back any light that hits them. Since there are more photons of red light than blue or green, this makes the sky appear red.
It is estimated that a human standing on Mercury's surface would see about eight hours of darkness each day. The rest of the time would be spent in intense sunlight.
People have speculated what it would be like to visit planets outside of our solar system. Some suggest that visiting Jupiter or Saturn could be fun because they are such large worlds, but they are also very far away and take years to reach, if they can be reached at all.
Others think it might be interesting to visit Mars, which is smaller than our moon but still larger than Earth.
Mercury resembles Earth's moon in appearance. Mercury's surface, like our moon's, is riddled with craters created by space rock strikes. Mercury has a thin atmosphere of atoms that have been blasted off its surface by solar radiation. This atmosphere swiftly escapes into space and is renewed on a regular basis. The composition of this gas is unknown but it probably contains hydrogen, helium, and traces of other elements such as oxygen and carbon.
Like the Moon, Mercury has been greatly affected by meteoroids from outside the Solar System crashing into its surface. These impacts have created large depressions in the planet's crust. Some of these may be as large as continents on Earth!
Meteor showers occur when particles from outside the Solar System enter Earth's atmosphere and burn up at high altitude, producing light flashes across the sky. The term "shower" comes from the resemblance of these lights to raindrops falling onto a window pane. The particles that make up a meteoroid collision are often rich in hydrogen and oxygen, which is why most meteor showers are seen in the hours before dawn or after dusk. The Leonid meteor shower is one exception; it usually appears between midnight and sunrise because it is made up of debris from an object called Phaethon that orbits the Sun twice per year. This asteroid is also responsible for most of the meteors observed during the Halloween meteor shower.