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By Jade Wilson
Physics P7…read more

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Movement of objects in Space
·Stars, planets and moon = travel east-west
·Sidereal day = times it takes Earth to rotate 360 degrees
·Solar day = 24 hours
·Stars = 23 hours 56 minutes travel once across the sky
·Moon = 24 hours 49 minutes to travel one across the sky
·Sidereal day is 4 minutes shorter than a solar day
·Dark face = new moon
·Light face = full moon…read more

Slide 3

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·Lunar cycle = moons appearance during 28-day orbit of Earth
·Solar eclipse = Moon passes between Earth and sun
·Lunar eclipse = Earth passes between sun and moon
·Parallax = Caused by the motion of observer
·Parallax angle of a star = half the angle moved against a background of a distance star in
6 month
·Parsec = Distance to a star with a parallax angle of one second of arc…read more

Slide 4

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· Converging (convex) lenses and concave mirrors can be used to focus parallel rays
of light.
· Power of a lens (in D) = 1 ÷ focal length (in m)
· A converging lens forms a real image of a distant source of light.
· A simple telescope uses two converging lenses. The eyepiece is more powerful
than the objective.
· Magnification = focal length of objective ÷ focal length of eyepiece.…read more

Slide 5

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· Most astronomical telescopes have concave mirrors as their
· The aperture of a telescope must be larger than the wavelength of the
radiation it detects.
· Many telescopes are sited on mountains or in space to reduce the
effects of the atmosphere, which refracts and absorbs electromagnetic
radiation.…read more

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Cepheid Variables
·Doesn't have a constant insintric brightness.
·It pulses and brightness depends of the frequency of the pulses
·Work out brightness by = how bright the star really is, how bright the star
·1920 ­ Edwin Hubble observed Cepheid variables in one nebula = nebula
was much further away than any star
·This means the nebula was a separate galaxy
·Further away a star was the faster it was moving away…read more

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Slide 9

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