Why is astronomy referred to as observational science and not primarily experimental science

Astronomy is referred to as observational science and not primarily experimental science because it focuses on the acquisition of data from observations of astronomical objects.

When this data are acquired,they undergo analysis and using basic principles of physics.

Unlike experimental Science which seems to build knowledge through directly observing and measuring of objects and phenomenon by scientists.

A good understanding of experimentation is important here.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]