Hubble's Galaxy Classification Diagram (The "Tuning Fork")

question 66

Multiple Choice

Hubble's galaxy classification diagram (the "tuning fork") .

• A)relates galaxies according to their shapes, but not according to any evolutionary status
• B)explains active galactic nuclei
• C)suggests the existence of black holes
• D)shows how galaxies evolve from one form to another

---

Definitions:

Blindness

The condition of lacking visual perception due to physiological or neurological factors.

Blind Spot

An area of the visual field that lacks detection due to the absence of photoreceptor cells in the part of the retina where the optic nerve exits the eye.

Optic Nerve

Twin nerves that convey sight-related information from the retina to the brain.

Retina

A layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain.