The astronomer Edwin Hubble discovered that virtually all galaxies are moving away from us and the further away they are, the faster they are moving. What is the best explanation of this observation?

All of the material in the universe began at a central point and is expanding into preexisting space More test answers on https://studyhippo.com/fdsci-209/

What is a good example of the galaxies moving away due to expansion is..?

Buttons attached to an expanding balloon. More test answers on https://studyhippo.com/phy-201-ch-18/

What is a likely candidate for the majority of the dark matter in galaxies?

Subatomic particles that we have not yet detected More test answers on https://studyhippo.com/mastering-astronomy-chapter-16-17/

Which of the following features is not a feature of central dominant galaxies?

They are often spiral galaxies. More test answers on https://studyhippo.com/astronomy-chapter-21/

What are the basic shapes into which astronomers classify most galaxies?

– irregular – elliptical – spiral More test answers on https://studyhippo.com/2-11-quiz-3/

In a photo like the Hubble Deep Field, we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives?

the galaxies that are farthest away More test answers on https://studyhippo.com/chapter-16-concept-quiz/

The spectra of most galaxies show redshifts. This means that their spectral lines _____.

Have wavelengths that are longer than normal. More test answers on https://studyhippo.com/astronomy-ch-5/

How are rotation curves of spiral galaxies determined beyond radii where starlight can be detected?

through observations of the 21 cm line of atomic hydrogen More test answers on https://studyhippo.com/astro-practice-2/

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