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The densest planet in our solar system is our own Earth. The least dense is Saturn. If all the planets were placed in a massive ocean, only Saturn would float.

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Dust storms sometimes cover the planet of Mars for months at a time. The storms, powered by solar heating, can envelop the entire planet in just days.

Ice caps, glaciers and permanent snow store around 65% of all the fresh water on our planet.

Venus is the hottest planet in our solar system. The surface temperature on Venus is a burning 461.85 °C (863.33 °F). On Pluto it is so cold that liquid nitrogen turns to solid! Pluto's estimated surface temperature is around -228°C (-378°F).

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The first man in space boarded the Russian spacecraft Vostok 1 in April 12, 1961 with a 50-50 chance of survival.

The first man in space boarded the Russian spacecraft Vostok 1 in April 12, 1961 with a 50-50 chance of survival. The spacecraft orbited the earth for one hour and 48 minutes and returned successfully.

The distance from the Earth to the sun is 92 million miles (146 million km). Even at the incredible speed of light, it takes 8 minutes for the sun's light rays to reach us once they leave the sun.

The Pacific Ocean is the biggest ocean in the world, accounting for 32% of the world's total surface area. That's slightly more than all the land in the world combined.

Earth's gravity field extends well into outer space. It's strong enough to keep our moon in place, and will eventually pull back all the satellites we have launched into orbit.

The day Saturday is named after the planet Saturn, which in turn was named after the Roman god of agriculture, Saturn.

Contrary to what many people think, the earth is the closest to the sun in the middle of winter. It is not the distance, but the tilt of the earth that causes the temperature changes of the seasons.

The planet Venus is named after the Roman goddess of love. It is the brightest planet in the night sky and the only planet to be named after a female.

Around 60 tons of cosmic dust falls down to Earth from outer space every day.

Around 60 tons of cosmic dust falls down to Earth from outer space every day. Every breathing organism inhales some of this ancient dust, which long ago may have formed a star or a planet.

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The biggest garbage patch in the world is found in the Pacific Ocean. It's made up of tiny plastic particles which can't be seen, but pose danger to all marine life. By preventing reflecting sunlight the plastic starves the algae and plankton living below.

In space, astronauts eat tortillas instead of bread due to safety reasons. Bread crumbs could get loose and damage delicate equipment on the spacecraft.

In space, astronauts eat tortillas instead of bread due to safety reasons. Bread crumbs could get loose and damage delicate equipment on the spacecraft.

Astronomers think Neptune may have oceans that are made up of liquid diamonds.

Astronomers think Neptune may have oceans that are made up of liquid diamonds.

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