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Magnitudes


Magnitudes Brightness
1 2.5

2 6.25

3 16

4 40

5 100

If the magnitudes decrease by 3 then
the star is 16 times brighter

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Lesson 1
Open clusters: loose aggregations of dozens or hundreds of
young stars.
Globular clusters: gravitationally bound groups of thousands
or millions of very old stars
Constellations: stars are named , , , , according to
their relative brightness
The last 2 stars of the plough point up to Polaris.…

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Polaris has a declination of 90. Its elevation is the same as
the latitude of the observer.
Circumpolar stars never set. I star is circumpolar if
declination > 90 - latititude.


Lesson 4
Sidereal day+ 23 hours 56 minutes
Solar day= 24 hours


Winter solstice=21s december
Autumnal equiox= 21st September…

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The distance is 1 divided by the parallax angle. D=1/p
Apparent magnitude: how bright an object appears from
earth
M = m + 5 ­ 5 log d
M is the absolute magnitude
m is the apparent magnitude
d is the distance in parsecs
Inverse square law: When the distance…

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Pluto
Ceres
Humea
Makemake
Eris
Asteroids: can be spherical or irregular and rocky or
metallic. Mostly found between mars and Jupiter.
Comets: short term ones from the Kuiper belt. Long term
ones from the oort cloud. They have very elipticle orbits.
When it is close to the sun they develop…

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Meteoroid: small body in space
Meteor: meteoroid colliding with earth's atmosphere
creating light trail
Meteorite: meteor that hits the ground




Lesson 12

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Lesson 13
Nuclear fusion= fusing together 2 or more lighter nuclei to
produce heavier ones.




Lesson 1




The


distance between the earth and the moon varies by up to
6%

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Lesson 15
Heliocentric universe = Copernicus




Retrograde motion
Keplars laws
1. Planets orbit in
ellipses, with the sun
at one focus




2. During a planet's orbit
around the Sun, equal areas
are swept out in equal times

Comments

Samantha Sonuga

Absolutely brilliant!

Durre

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