WR Stars	O Stars	B Stars	A Stars	F Stars	G Stars	K Stars	M Stars	L Brown Dwarf	T Brown Dwarf	Y Brown Dwarf	Sub Brown Dwarf	White Dwarf Stars	Neutron Stars	Black Holes
0	0	0	2	0	13	6	17	0	0	0	0	0	0	0

The Total Planet Count within 21 to 30 Light Years includes 0 Mercurian planets, 0 Sub-Terran planets, 0 Terran planets (Earth-Size), 0 Super Terran planets, 4 Sub-Neptunian planets, 9 Neptunian planets, 2 Jovian planets, and 3 Super Jovian planets.

Super Jovian Planets	Jovian Planets	Neptunian Planets	Sub Neptunian Planets	Super Terran Planets	Terran Planets	Sub Terran Planets	Mercurian Planets
3	2	9	4	0	0	0	0

There are 0 planets within 21 to 30 Light Years that orbit in the habitable zone of their star that might potentially harbor intelligent Alien life.

The most notable planet within 21 to 30 Light Years is planet HR722 b. HR722 b is a Neptunian-sized planet that orbits within the habitable zone of its star. Does HR722 b have moons orbiting this planet that may be habitable?

Planets have also been categorized according to their ESC, or Earth Similarity Class. Some scientists call this the Earth Simiarlity Index, or ESI. ESC is an indicator of how "Earth-like" a planet may be, based upon the following 20 criteria: whether a planet is in the habitable zone of their star (the area where liquid water could exist), if the planet is tidally locked (one side always faces its star), axial tilt, orbit eccentricity, size, mass, diameter, density, gravity, atmosphere, atmosphere pressure, ozone layer, magnetic field, parent star solar flares, average temperature, liquid water, land, plants, animals, and intelligent beings.

Planets outside of our solar system have ESC's calculated given the current data that is available. Their real ESC may rise or fall once complete data has been discovered. ESC will only be calculated for rocky planets and not for Gas Giant planets. ESC does not nessarily indicate that a planet is "habitable" or can support life as we know it. ESC only gives us a general indication about how that planet compares to Earth given currently available data. Images that are displayed for planets are theoretical based upon the current available data. Images may be updated as new planetary data is discovered.

In addition, any planet that has a green background, is located within the "habitable zone" of that star. The habitable zone of a star is defined as the area around a star where liquid water could possibly reside on a planet, given that the planet has sufficient atmospheric pressure and a temperature that allows for liquid water. It does not indicate that a planet will be "habitable" just because it's located within that star's habitable zone.

Also, any planet that has an orange background, is located in the habitable zone, however, the planet is bombarded by strong solar flares from its parent star. Finally, any planet that has a red background, is located in the habitable zone, however, the planet is bombarded by extreme solar flares from its parent star.