Trapezium

A popular name for the multiple star system Theta1 (q1) Orionis, which lies at the heart of the Orion Nebula and illuminates it. The name comes from the pattern formed by four stars, of magnitudes 5.1, 6.7, 6.7 and 8.0, which are visible in a small telescope. A larger telescope reveals the presence of two other stars of eleventh magnitude.