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CRCT Question. Which planet is almost identical in size to Earth ? Mars Neptune Moon Venus. Week at a Glance. Monday: Sun Notes #1 Tuesday: Sun Notes #2 Wednesday: Workday Thursday: Telescope Notes Friday: Workday Next Week: Wednesday: QUIZ Thursday: Project DUE. Big Bang

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crct question

CRCT Question

Which planet is almost identical in size to Earth?

Mars

Neptune

Moon

Venus

week at a glance
Week at a Glance

Monday: Sun Notes #1

Tuesday: Sun Notes #2

Wednesday: Workday

Thursday: Telescope Notes

Friday: Workday

Next Week:

Wednesday: QUIZ

Thursday: Project DUE

a classifying stars
a. Classifying Stars

1. size of the star – supergiant, giant, medium, white dwarfs, neutron stars.

2. color - surface temperature - Coolest are red, then orange, yellow (our Sun), blue, white

3. brightness – magnitude

a. apparent magnitude– close stars look brighter

b. absolutemagnitude– actual light

slide6

Supergiant

Giant

Medium sized

White dwarf

Neutron star

1. Star sizes

slide8

Star color

2. Determined by surface temperature.

  • Hottest are blue
  • Coolest are red.
slide9

Color

Of

Stars

Video

slide10

3. Absolute vs.

apparent magnitude

i. Absolute magnitude is how much light is actually given off by a star.

ii. Apparent magnitude is how bright a star appears to be due to how close or far away it is.

slide11

Two astronomers discovered a relationship between the absolute magnitude (real brightness) of a star and its surface temperature. They plotted the data on a graph.

Henry Russell

USA

EjnarHertzsprung

Denmark

slide12

So what does this show?

Stars seemed to naturally group together

slide14

4. Grouping Stars

They discovered that stars grouped by type and during their lifetimes would move from one place on the graph to another.

As our sun ages, it will move to a giant star to a white dwarf.