The Twinkling Facts about Stars By: Brielle Chan

The Twinkling Facts about Stars By: Brielle Chan

The Twinkling Facts about Stars By: Brielle Chan What is a Star? a luminous globe of gas Stars produce their own heat and light by nuclear reactions (nuclear fusion) Stars must be large enough that fusion is triggered at its core Some examples are: red dwarfs, white dwarfs, and red supergiants (no wonder Wall-E is so fascinated with them)

What are Stars Made of? What do they burn? Stars are balls of exploding gas Stars are mainly comprised of two types of gas The to main types of gas are hydrogen and helium Stars burn hydrogen and helium Stars can burn hydrogen and helium without the

need for oxygen Types of Stars: Stars are classified by the elements that they absorb and their temperature There are seven main types of stars The seven main types in decreasing temperature order are: O, B, A, F, G, K, and M A Mnemonic remembering device is: "Oh Be A Fine Guy/Girl, Kiss Me." Type o and B Stars O Stars

B Stars An O-type main-sequence star burns hydrogen O stars have between 15 and 90 times the mass of the sun O stars have surface temperatures between 30,000 and 52,000 k A B-type main-sequence star burns Hydrogen B Stars are 2 to 16 times the mass of the sun

B stars have surface temperatures between 10,000 and 30,000 K Type A and F Stars A Stars F Stars An A-type main-sequence star burns hydrogen and is also known as A dwarf Star A stars have spectra which are defined by strong Hydrogen balmer

absorption lines They have masses from 1.4 to 2.1 times the mass of the Sun and surface temperatures between 7600 and 11,500 K An F-type main-sequence star burns Hydrogen F stars have from 1.0 to 1.4 times the mass of the Sun F stars have surface temperatures between 6,000 and 7,600 K

Type G and K Stars G Stars K Stars G stars are mainsequence stars These stars are often referred to as yellow dwarfs Such stars have about 0.8 to 1.2 of solar mass and a surface temperature of between 5,300 and 6,000 K

A k type main-sequence star is sometimes referred to as an orange dwarf or K dwarf They burn Hydrogen They have masses between 0.45 to 0.8 times the mass of the sun Surface temperatures between 3,900 and 5,200 K Type M Stars M stars have a subcategory of Red Dwarf stars They range in mass from a low of 0.075 solar masses to about 0.50 They have a surface temperature of less than 4,000 K

They are the most common type of star in the Milky Way The Biggest and Smallest stars Biggest: Smallest: The biggest star type is called a red supergiant, and the biggest red supergiant is called VY Canis Majoris.

The smallest star type is called a red dwarf, and the smallest red dwarf is called OGLE-TR-122b. The brightest and dullest stars Brightest: Dullest: The brightest star other than the Sun in the view of Earth is called Sirius, and Sirius' star classification is

a1v. The dimmest stars are called white dwarfs. (In terms of robots, Eve is physically brighter than Wall-E) Hertzsprung-Russell Diagram The Hertzsprung-Russell Diagram is also known as the HR Diagram Its purpose is to classify stars according to their luminosity,

spectral type, color, temperature and evolutionary stage. Midway Quiz! Questions 1 and 2 What are stars? a) Luminous balls of gas b) Fire balls c) Sky dcor for people to look at d) Bits from space burning up to appear as if they glow

Which two gases are most prominent in stars? a) Carbon & oxygen b) Hydrogen & argon c) Hydrogen & helium d) Helium & Xenon Questions 3 and 4 What are the 7 types of stars in decreasing temperature order? What is the biggest type of star called?

A) A, B, C, D, E, F, G B) O, B, A, F, G, K, M C) O, B, F, A, G, K, M D) Z, L, k, O, M, A, G A) Red dwarf B) White supergiant C) Orange supergiant D) Red supergiant Questions 5 and 6 Whats the smallest type of star called?

Whats the brightest star other than the sun in view of Earth? a) b) c) d) A) Sirius B) Joke C) Constance D) Wall-E

White dwarf Red dwarf Yellow dwarf Green supergiant Questions 7 and 8 What is the type of star that is the dullest? What type of diagram is this? A) Red dwarf B) Supernova

C) White dwarf D) Yellow dwarf a) Hertzsprung-Russell diagram b) Teslacoil-russell Diagram c) Star graph d) Bar diagram Answer Key: 1. 2. 3. 4. 5.

6. 7. 8. A C B D B A C A The stages of a stars life:

Nebula they form into a star when their nuclei to fuse together Star A star wells up into a red giant Red Giant - loses its outer layers as a Planetary Nebula and finally shrinks to become a white dwarf or red dwarf Red Dwarf White Dwarf Supernova - Stars eventually after a while turn into exploding supernovas and then into neutron stars Neutron Stars Neutron stars turn into black holes that suck up everything around them Black hole the death of a star as it isnt one anymore The oldest and youngest stars Oldest:

Youngest: The oldest known star is called methuselah. The youngest known star is said to be called L1448IRS2E. How stars are born They are born from nebulae and consist mostly of hydrogen and helium gas A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to fuse

together A nebula is a cloud of gas (hydrogen) and dust in space How stars die When stars start to die they begin to fade and start as a red supergiant Stars eventually after a while turn into exploding supernovas The supernovas then turn into black holes That is then the end of the stars life What type of star is our Sun? The sun visible from Earth is a yellow dwarf star and is surprisingly one of the smaller stars, compared to others,

but is still an average size. Information for the test Study flashcards: https://quizlet.com/107902287/flashcards Information for the test Final Test! Questions 1 and 2 What are stars? a) Luminous balls of gas b) Fire balls

c) Sky dcor for people to look at d) Bits from space burning up to appear as if they glow Which two gases are most prominent in stars? (2 marks for both gases) a) b) c) d) Carbon & oxygen

Hydrogen & argon Hydrogen & helium Helium & Xenon Questions 3 and 4 What are the 7 types of stars in decreasing temperature order? What is the biggest type of star called? A) A, B, C, D, E, F, G B) O, B, A, F, G, K, M

C) O, B, F, A, G, K, M D) Z, L, k, O, M, A, G A) Red dwarf B) White supergiant C) Orange supergiant D) Red supergiant Questions 5 and 6 Whats the smallest type of star called? Whats the brightest star other than the sun in view of Earth?

a) b) c) d) A) Sirius B) Joke C) Constance D) Wall-E White dwarf Red dwarf Yellow dwarf

Green supergiant Questions 7 and 8 What is the type of star that is the dullest? What type of diagram is this? (2 marks) A) Red dwarf B) Supernova C) White dwarf D) Yellow dwarf

a) Hertzsprung-Russell diagram b) Teslacoil-russell Diagram c) Star graph d) Bar diagram Questions 9 and 10 What is the stage in a stars life right before supernova? What is the oldest star known called? A) Red dwarf

B) Star C) Black hole D) White dwarf a) Libra b) Sirius c) Methuselah d) 858 hytgj Questions 11 and 12 What is the youngest known star called? A) Dwarf

B) L1448-IRS2E C) Thyji-9067 What are stars born from? A) Nebulae B) Supernovas C) Dwarf stars D) Black holes Questions 13 and 14 What happens to a star after the supernova stage?

What type of star is the sun and what size is it? (2 marks) A) A black hole B) Nothing C) It explodes more D) A supernova doesnt exist A) Red dwarf, small B) White dwarf, average C) Yellow dwarf, average D) Red supergiant, big

Answer Key: 1. 2. 3. 4. 5. 6. 7. 8. A C B D

B A C A 9. D 10. C 11. B 12. A 13. A 14. C

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