Are There Types of Galaxies in Which We Can See

question 28

Multiple Choice

Are there types of galaxies in which we can see completely through their centers?

• A) No.The intense gravity generated by the central black hole will bend light beams passing through all galaxies,even if they have few stars.
• B) Yes.Dwarf galaxies have very few stars that are not closely packed,even near their centers.
• C) No.All galaxies have dense central bulges and most contain a central black hole.
• D) Yes.Space has been cleared through the centers of some very massive galaxies by their central supermassive black holes,producing a tunnel.

---

Definitions:

Higher-order Conditioning

A form of learning in which a stimulus is paired with a previously conditioned stimulus, creating the same conditioned response.

Established CS

In the field of classical conditioning, it refers to a previously neutral stimulus that, after association with an unconditioned stimulus, now triggers a conditioned response.

New CS

In classical conditioning, a novel conditioned stimulus that is introduced and associated with an unconditioned stimulus to elicit a conditioned response.

Operant Conditioning

An educational method where the intensity of an action is altered via rewards or penalties.