Post on 18-Jan-2018
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Stars By Logan willis What are stars? Stars are luminous spheres
of plasma thathave their own gravity and have a fixedposition in
space. They are extremely burning hot. The nearest star to us is
the sun. They are made up of mainly hydrogenand helium, but have a
little bit of otherelements like oxygen and carbon as well. What do
stars do? Stars burn by fusing hydrogen intohelium. This is what
gives them their lightand heat. They have a gravitational pull, and
sothey pull planets into orbit and createsolar systems. Stars in
massive groups are calledgalaxies. Types of stars There are a few
different types of stars. Some areyellow dwarf stars, red dwarf
stars, red giant stars, bluegiant stars, and supergiants. Dwarf
stars are smaller and giants are bigger,obviously. Our sun is a
yellow dwarf star, and it is the smalleststar. The biggest star VY
Canis majoris, and it is times the size of our sun. It is a red
hypergiant. The brightest star in the earths night sky is Sirius.
Midway quiz Are you ready? Click for the answers again to
confirm.
Time for a quiz! Click for the answers! What are the two main gases
in stars? How do stars burn? What are massive groups of stars
called? Name 3 types of stars What is the largest star? What is the
smallest star? What type of star is our sun? What is the brightest
star in earths sky? Hydrogen and helium They fuse hydrogen into
helium Galaxies Some types: Red dwarfs, yellow dwarfs, White
dwarfs, blue giants, red giants, supergiants 5. Vy canis majoris 6.
Our sun 7. Yellow dwarf 8. Sirius A stars life Stars last millions
or even billions of years, but even they eventually die. The bigger
the star, theshorter the life span because they burn their energy
faster. Stars are born when clouds of dust and gas have a
gravitational disturbance, like a nearbysupernova. Clumps begin to
form in the cloud, and compress and heat up. Eventually, a
protostar isformed, which is the core of the star. The protostar
heats up so much and collects so much dust and gas that it releases
a massive amountof gas in the form of a jet, called a bipolar. The
dust eventually clears up, and you now have a youngstar. As stars
get older, they slowly expand. Eventually, when their core runs out
of hydrogen andhelium, the star collapses and explodes, causing a
nebula or supernova. Nebulas become a white dwarf, then a black
dwarf, and supernovas become neutron stars or blackholes. The
oldest star is nicknamed Methuselah star, and is and estimated 0.8
billion years old. Theyoungest star is AU Microscopium and is only
about 12 million years old. Our own sun is about 4.6billion years
old. I couldnt get the video embed to work, so go watch the video
here:
https://www.youtube.com/watch?v=znxFrgql5dc (This is just a
picture) Hertzsprung-Russell diagram
Hertzsprung- Russell diagrams arediagrams that plots each star on a
graphmeasuring the stars brightness againstits brightness. It does
not show star locations. It was created by Ejnar hertzsprung
andhenry Norris Russell. Final test Click here to take the final
test: https://www.onlineexambuilder.com/star-quiz/exam Conclusion I
hope you learned more about stars andour own sun. Thanks for
watching! Also, check out the show firefly becauseits awesome. Go
here for some flashcards to study:https://quizlet.com/ /rside-
stars-loganw-flash-cards/?new