The star shapes represent nebulae, diamond shapes are variable stars, triangles are double stars, rectangular boxes are galaxies, and square shaped objects represent clusters. Explain what each of the objects is and how studying it has helped in furthering understanding in the field of Astronomy. An accumulation of gas and dust. Studying Nebulae have increased astronomers understanding of the life cycle of stars. These are the birthplace of stars.
Gravity pulls the gasses together until the added pressure causes fusion.
Nebulae can also be related to the death of stars. As stars lose mass, its gravitational pull is reduced and gases are lost to the surrounding space. Way Galaxy are actually twins. That makes our sun part of a galactic minority. These double stars appear to revolve around each other, but in reality orbit a common center of mass between them.