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Astronomy How things move in space Measuring things in space

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Presentation on theme: "Astronomy How things move in space Measuring things in space"— Presentation transcript:

1 Astronomy How things move in space Measuring things in space
How stars evolve and change Big questions for science

2 Parallax

3 Parallax

4 HOW did you know that??? Point to a star that you think is close.
Point to a star you think is far… HOW did you know that???

5 Parallax animation

6 Two things that affect parallax: 1. Distance to star 2. Baseline

7 Supplies to gather after reading background material
Meter Stick Lined strip of paper 2 ring stands Clip Blue paper with holes 2 pieces of tape

8

9 Parallax The closer stars appear to shift relative to the background because of earth’s movement around the sun. Closer the star, greater the parallax! Larger the baseline, greater the parallax!

10 TRY THIS Parallax online activity

11 How to find the distance to an object:
3000 miles Earth Moon 0.7 Distance = d

12 TRIG!!

13 C. Finding the Distance to the Moon by Parallax
In this method, two observers simultaneously observe the Moon against the starry background from positions 6000 miles apart. The Moon’s position against the stars differs by 1.4. 3000 miles d Earth Moon 0.7 *

14 C. Finding the Distance to the Moon by Parallax
Observers are 6000 miles apart. Moons position changes by 1.4 sin (0.7) = 3000 miles / d = 3000 miles / d d = 3000 miles / d = 246,000 miles 3000 miles d Earth Moon 0.7 *

15 How to find the distance to Proxima Centauri:
Parallax Angle = degrees Radius of our orbit = 9.3 x 107 miles 1 lightyear = 5.9 x 1012 miles

16 New unit for measuring distance: Parsecs

17 If baseline is 1 AU … 1 ÷ ÷ d Distance p Parallax x

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