Depending on the time of year and its position in the sky, Mars can be seen from Earth with the naked eye or in more detail with a small telescope. To the naked eye, Mars appears as a bright red star. With a telescope, observers will be able to see things like the polar ice caps, clouds and impact craters.
Mars is approximately 39.9 million miles from Earth. There are 668 Earth days in one year on Mars, and it experiences seasons similar to Earth's seasons.
Mars is a very dusty planet with a harsh climate. Scientists do not believe the planet could sustain human life due to its environmental conditions.Learn More
For most of the year, Venus is visible to the naked eye. The exception to this is when Venus is too close to the sun to be observed.Full Answer >
A fine-grained igneous rock is a rock that is formed by melted magma cooling so quickly at the surface of the Earth that only tiny crystals form, most too small to be seen with the naked eye. Basalt is an example of such a rock.Full Answer >
Both Earth and Uranus are spherical, orbit the sun and tilt on their axes. Though the time to orbit the sun by the Earth is a year, it takes Uranus 84 Earth years to do the same.Full Answer >
The discovery that the Earth is round is most commonly ascribed to the ancient Greek philosopher Pythagoras, while the credit for proving it is usually given to Aristotle. It appears that most ancient Greek philosophers that followed him believed in a round Earth. Since the records from that time are not perfect, it is quite possible that someone before him was aware of the Earth's round shape.Full Answer >