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These are hypothetical planets, but researchers have found mathematical evidence that suggests they may exist in the solar system. They are imagined as Neptune sized planets that are orbiting the Sun and nicknamed as ‘Planet Nine.’ These planets may have a mass about 10 times that of Earth’s mass and orbit at a distance 20 times farther than Neptune from the Sun. They may take between 10,000 and 20,000 Earth years to make one full orbit around the Sun. Though, no such planet has been discovered for certain yet.

As you may know, the Earth's axis is tilted over by degrees and the Earth's North Pole currently points at the star known as Polaris - the North Star. The app is arranged so that the view is fixed to the stars and that Polaris is always off the top of the screen (and not shown). This means that the Earth's north pole is (currently) pointing towards the top of the screen, and the south pole towards the bottom. During the summer months of the northern hemisphere the north pole is pointing more towards the Sun and so the Earth is shown below the Sun. During the summer months of the southern hemisphere, the south pole points towards the Sun and so the Earth is shown above the Sun.

As we improve our understanding of the universe, the definitions of the words we use to describe the cosmos will continue to change, too.

Science is full of arguments like this. That’s what makes it so interesting. What do you think? Do all planets, even exoplanets, need to form around stars?

With the discovery and observation of planetary systems around stars other than the Sun, it is becoming possible to elaborate, revise or even replace this account. The level of metallicity —an astronomical term describing the abundance of chemical elements with an atomic number greater than 2 ( helium )—appears to determine the likelihood that a star will have planets. [ 26 ] [ 27 ] Hence, a metal-rich population I star is more likely to have a substantial planetary system than a metal-poor, population II star . [ 28 ]