Transcript Star project

STARS
BY LOGAN WILLIS
WHAT ARE STARS?
• Stars are luminous spheres of plasma that
have their own gravity and have a fixed
position in space.
• They are extremely burning hot.
• The nearest star to us is the sun.
• They are made up of mainly hydrogen
and helium, but have a little bit of other
elements like oxygen and carbon as well.
WHAT DO STARS DO?
• Stars burn by fusing hydrogen into
helium. This is what gives them their light
and heat.
• They have a gravitational pull, and so
they pull planets into orbit and create
solar systems.
• Stars in massive groups are called
galaxies.
TYPES OF STARS
• There are a few different types of stars. Some are
yellow dwarf stars, red dwarf stars, red giant stars, blue
giant stars, and supergiants.
• Dwarf stars are smaller and giants are bigger,
obviously.
• Our sun is a yellow dwarf star, and it is the smallest
star.
• The biggest star VY Canis majoris, and it is 950-1200
times the size of our sun. It is a red hypergiant.
• The brightest star in the earth’s night sky is Sirius.
MIDWAY QUIZ
Time for a quiz!
Are you ready? Click for the answers again
to confirm.
Click for the answers!
1. What are the two main gases in stars?
2. How do stars burn?
3. What are massive groups of stars called?
4. Name 3 types of stars
5. What is the largest star?
6. What is the smallest star?
7. What type of star is our sun?
8. What is the brightest star in earth’s sky?
1. Hydrogen and helium
2. They fuse hydrogen into helium
3. Galaxies
4. 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 STAR’S LIFE
• Stars last millions or even billions of years, but even they eventually die. The bigger the star, the
shorter the life span because they burn their energy faster.
• Stars are born when clouds of dust and gas have a gravitational disturbance, like a nearby
supernova. Clumps begin to form in the cloud, and compress and heat up. Eventually, a protostar is
formed, 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 amount
of gas in the form of a jet, called a bipolar. The dust eventually clears up, and you now have a young
star.
• As stars get older, they slowly expand. Eventually, when their core runs out of hydrogen and
helium, 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 black
holes.
• The oldest star is nicknamed Methuselah star, and is and estimated 14.46 ± 0.8 billion years old. The
youngest star is AU Microscopium and is only about 12 million years old. Our own sun is about 4.6
billion years old.
• I couldn’t 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 are
diagrams that plots each star on a graph
measuring the star’s brightness against
its brightness.
• It does not show star locations.
• It was created by Ejnar hertzsprung and
henry Norris Russell.
FINAL TEST
Click here to take the final test:
https://www.onlineexambuilder.com/star-quiz/exam48720
CONCLUSION
• I hope you learned more about stars and
our own sun. Thanks for watching!
• Also, check out the show firefly because
it’s awesome.
• Go here for some flashcards to study:
https://quizlet.com/108521579/rsidestars-loganw-flash-cards/?new