Post on 28-Dec-2015
I WILL CLASSIFY STARS BASED ON THEIR
PROPERTIES.
Learning Target
STARS
1 Why are stars different colors?2 How can scientists learn what stars are made of?3 How can we measure the distance between stars?4 Why do stars seem to move across the sky?
Follow along in your workbook notes.
=videos to watch
WHY ARE STARS DIFFERENT
COLORS?
p. 365
WHAT ARE STARS MADE OF?
p. 365
HOW CAN SCIENTISTS LEARN ABOUT STARS FROM
THEIR LIGHT?
p. 366
WHAT CAN SCIENTISTS LEARN FROM A STAR’S
LIGHT?
p. 366
HOW DO SCIENTISTS CLASSIFY STARS?
p. 366-367
2 WAYS STARS ARE CLASSIFIED
TEMPERATURE
LUMINOSITY
DOES DISTANCE CHANGE A STAR’S BRIGHTNESS?
p. 368
THE STAR IN OUR NIGHT SKY WITH THE GREATEST ABSOLUTE MAGNITUDE IS
Sirius? Betelgeuse? The Sun? Polaris?
YOU JUST SAW A CONSTELLATION. -A constellation is a group of stars that
appear to be next to each other in space.
-When the stars are connected, they resemble figures or things.
-For centuries, people thought the position of the moon or planets in these constellations at the time of your birth determined your fate (Astrology)
Examples of constellations include the following…
ORION
CANIS MAJOR
TAURUS
PEGASUS
VIRGO
LYRA
URSA MAJOR AND URSA MINOR
THE SOUTHERN CROSS
CIRCUMPOLARStars that are seen all year long
Constellations 101
Will Polarisalways be the NorthStar?
Does it looklike a dipper fromanywhere inspace?
HOW DO SCIENTISTS MEASURE DISTANCE TO A
STAR?
p. 368-369
AND HOW ARE STAR DISTANCES MEASURED? Light Year – the distance light travels in 1
year It is equal to about 6 trillion miles!
The next closest star, Proxima Centauri, is 4.2 light years away.
Sirius is 8.6 light years away.
Parsec—say what?! (3.26 light years)
But how do we measure the distance to a star?Parallax
COMPLETE THE REVIEW QUESTIONS
IN TEAMS.
p. 370
THE LIFE CYCLE OF STARS
1 How do stars change over time?2 What is an H-R diagram?3 What may a star become after a supernova?
Follow along in your workbook notes.
Reread each page and answer questions on those pages as you gothrough this powerpoint.
=videos to watch
HOW DO STARS AGE?
p. 371-372
DRAW A PICTURE NEXT TO EACH BOX OF THE FLOW CHART ON P.372.
WHAT IS AN H-R DIAGRAM?;WHY DOES A STAR’S POSITION
ON THE H-R DIAGRAM CHANGE?
p. 372-374
WHAT HAPPENS TO MASSIVE STARS AS THEY
AGE?
p. 374-375
NEBULA -Cloud of gas
and dust -Mostly
hydrogen -Shockwaves
from the outside force the cloud to condense to start a star forming
PROTOSTAR -early stars that
have just begun to condense (compact together)
MAIN SEQUENCE STAR Normal -average,
middle-aged star like the Sun
Massive -middle-aged
star, but very heavy
GIANT OR SUPERGIANT -bright stars that
are 10 to 100 times larger than the Sun
-form when much of the smaller atoms have been fused
-bright star this usually well over 100 times greater than the Sun
-go through fusion fast! (millions of years)
PLANETARY NEBULA OR SUPERNOVA
-forms when the outer gases of a giant dissipate in a halo shape
-likely to condense somewhere as a new planet
-the sudden collapse of a supergiant that lasts just a few moments
-million times brighter than normal
DWARF -the left over
glowing core of a giant star
-the fate of our Sun
NEUTRON STAR OR BLACK HOLE
-the VERY VERY dense leftover core of a supergiant that exploded (supernova)
COMPLETE THE REVIEW
QUESTIONS.
p. 376