The Soul Nebula is an open cluster of stars surrounded by a cloud of dust and gas over 150 light - years across and located about 6,500 light - years from Earth in the constellation Cassiopeia, near the Heart Nebula.
Trapezium (Theta1Orionis) is a star cluster at the heart of the Orion Nebula consisting of more than 1,000 young stars crowded into a space about four light - years in diameter (roughly the distance between the Sun and the next nearest star).