ระบบซึ่งเป็นผลรวมของดาราจักรทั้งหมด คือ ดาวเคราะห์ ดาว พลังงาน และสิ่งอื่น ๆ ในอวกาศ
ఆకాశంలో మనకు కనిపించే కోటానుకోట్ల నక్షత్రాలు, గ్రహాలు, తోకచుక్కలు మొదలయిన అంతరిక్ష పదార్ధాల సముదాయమునే విశ్వము అంటాం.