3.3 - Using Technology to Interpret Space Flashcards Preview

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Flashcards in 3.3 - Using Technology to Interpret Space Deck (12):
1

How would you use triangulation to determine the distance of an object?

- Measure the length of the baseline
- Measure the angles created between the ends of the baseline and the sides of the triangle
- Make a scale drawing of the triangle using the length of the baseline and the two angles
- Make a perpendicular line from the baseline to the object. Measure this line and use the scale to convert it to it's actual length

2

What is a parallax?

The apparent shift in position of a nearby object, when the object is viewed from 2 different places

3

Why is a star's parallax useful to astronomers?

Because they can then use the parallax to triangulate the star's distance from Earth. The larger the baseline , the more accurate the result

4

What is the longest baseline that astronomers can use to triangulate a star's distance from Earth?

The longest baseline that astronomers can use is the diameter of Earth’s orbit (measurements have to be taken 6 months apart)

5

What is a spectroscope?

An object that refracts light from stars to determine their composition

6

How can a star's spectrum be used to determine a its composition

On their spectra, stars have a series of dark bands in distinct sequences and thicknesses. Because each element in a star creates it's own black-line “fingerprint”, a star’s spectrum can be used to determine its composition

7

What is the Doppler effect?

The apparent change in the frequency of a wave caused by relative motion between the source of the wave and the observer

8

When the Doppler effect occurs, what happens when the source moves closer to you?

- As the source moves closer to you, the waves are compressed
- As the source moves away from you, the waves are stretched

9

What can changes in waves be used to measure?

Changes in waves can be used to measure how fast and in what direction a light-emitting object (such as a star) is moving.

10

In a red shift, what is occurring?

Star is moving away from you, light waves are being stretched

11

In a blue shift, what is occurring?

Star is moving towards you, light waves are being compressed

12

What does the amount of shift in a star indicate?

The amount of shift indicates speed