The planet Mercury is the closest planet to the Sun within the solar system . Because of its closeness to the sun , it is one of the hottest planets in the solar system. It is visible just before sunset or just before sunrise, and appears like a bright star in the sky,commonly called MORNING OR EVENING STAR
Mercury was named by the Romans after their god of the same name. In Roman mythology Mercury is the god of commerce, travel and thievery, the Roman counterpart of the Greek god Hermes , the messenger of the Gods. The planet probably received this name because it moves so quickly across the sky.
Surface of Mercury is very similar to our own moon, heavily cratered and barren .
Temperatures on Mercury can range anywhere from 90 to 700 degrees K!
Venus is the second closest planet to the sun. Viewed from earth it is the brightest of the planets.
In fact if you know where to look it is possible to see it in broad daylight. At night it is bright enough to cast shadows. It's brightness is due to two things. Firstly it is quite close to earth compared to the other planets. Secondly it is highly reflective and a lot of sunlight bounces off the planet.
In the 1970s American and Russian probes were sent through the clouds to measure surface temperature and analyze the atmosphere. None of these probes lasted very long and the reasons soon became clear. The temperature at ground level was 840 degrees Fahrenheit, the atmospheric pressure was 90 times that of earth and the atmosphere was highly corrosive. Basically if you send a probe to Venus it will either melt, be crushed or rust.
It is the third planet from the sun. The earth is the only planet in the solar system on which life exists , on account of correct distance from the sun , correct temperature and the presence of air , water and soil.