The Light from the MOST Recent Supernova That Was Visible

question 272

Multiple Choice

The light from the MOST recent supernova that was visible to the unaided eye arrived at Earth in a.d.:

• A) 1604.
• B) 1054.
• C) 1987.
• D) 1572.

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Definitions:

Prostatic Secretions

Fluid produced by the prostate gland that is one component of semen, providing nutrients for sperm and lubrication during ejaculation.

Urethra

The duct through which urine is discharged from the bladder to the exterior of the body in both males and females, and also serves as a conduit for semen in males.

Micturition Reflex

Contraction of the urinary bladder stimulated by stretching of the bladder wall; results in emptying of the bladder.

Blood-testis Barrier

A physical barrier between the blood vessels and the seminiferous tubules of the testes, protecting germ cells from harmful substances in the bloodstream.