I'm a hypothetical planet, they call me Planet 9
In the outer solar system, you may notice me in time
I'm a hypothetical planet, they call me Planet 9
I orbit your sun, when I'm discovered I'll make headlines
I have yet to be discovered, astronomers search for me
That's the reason I'm a hypothetical planet you see
Astronomers think I am in the outer solar system
I spin beyond Neptune's orbit
That's where they think I've been
The reason astronomers think that I do exist
Because of clustering extreme trans-Neptunian objects that orbit
They think on average I orbit the sun 250 times that of the Earth
But no one knows, until me they find
Konstantin Batygin and Michael E. Brown
Think I could be the core of a giant planet that used to be around
They think my original orbit used to be by Jupiter
During the genesis of the solar system, then eject it they sure
As of May 2020, there's no observation of Planet 9
But they have not ruled out my existence
They might find me in time
Wide-field infrared survey explorers survey space
Looking for me in the outer solar system, but still haven't found a trace
I'm a hypothetical planet, they call me Planet 9
In the outer solar system, you may notice me in time
I'm a hypothetical planet, they call me Planet 9
I orbit your sun, when I'm discovered I'll make headlines
My semi-major axis is four to 800 AU
AU means Astronomical Units in this lesson I teach you
My Earth mass is thought to be between five to ten
15 to 25 degrees is my orbital inclination
After the discovery of Neptune in 1846
There's been speculation of another planet that might exist
Maybe you'll become an astronomer and be the first to discover me
But until then I'll be hypothetical planet you see
I'm a hypothetical planet, they call me Planet 9
In the outer solar system, you may notice me in time
I'm a hypothetical planet, they call me Planet 9
I orbit your sun, when I'm discovered I'll make headlines
I'm a hypothetical planet, they call me Planet 9
In the outer solar system, you may notice me in time
I'm a hypothetical planet, they call me Planet 9
I orbit your sun, when I'm discovered I'll make headlines