Astronomers Have Noticed That the Visible Filaments in the Crab

question 30

Multiple Choice

Astronomers have noticed that the visible filaments in the Crab Nebula are moving toward us at great speed. How can they know about motions like this?

• A) from the width of the pulsar pulses
• B) from the color of the nebula's continuous radiation
• C) from the spacing of the pulsar pulses
• D) from the H-R diagram
• E) from the Doppler shift in the line radiation from the nebula

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Definitions:

Sterile Urine Specimen

A urine sample collected in a way that prevents contamination to ensure accurate testing for diagnostic purposes.

Needleless Access

A medical technology designed to gain access to the vascular system without using needles, reducing the risk of needlestick injuries.

Antiseptic Wipes

Pre-moistened towelettes used to cleanse the skin of germs to reduce the risk of infection.

Indwelling Urinary Catheter

A catheter that remains inside the bladder for a continuous period to drain urine, often used in patients with urinary retention issues.