The surface temperature is fiercely hot and the atmospheric pressure is crushing.

One of the more apparent things that separate Venus from all the other planets in our solar system is that it rotates from east to west (all the other planets rotate from west to east).

The remnant Sun will fade gradually to oblivion, passing through the white dwarf stage on its way.

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It is the smallest of the inner planets and the second smallest in the whole Solar System.

It has a very weak magnetic field and – being the closest planet to the Sun – has only a very thin atmosphere of helium captured from the solar wind.

The surface temperature rose and the oceans dried up.

Earth – The Earth, the third planet (rock) from the Sun, is the largest of the inner planets and also has the highest density.

Pluto’s orbit deviates the most from the plane of the ecliptic with an inclination of 17 degrees.

The Sun is the most important part of our solar system.

These objects, together with many lesser masses, are known as the Solar system.

The Sun is just a star, one of a hundred billion inhabiting our galaxy alone.

In addition to 78 percent by weight of hydrogen, they find 20 percent to be helium, while only 2 percent remains for other elements such as oxygen, carbon, nitrogen, and iron.

Later, as its hydrogen becomes depleted, it will evolve into a giant red star, swelling to engulf the earth and the inner planets.

The outer regions have not yet taken part in hydrogen burning.