Star Properties Where do stars come from Stars
- Slides: 52
Star Properties
Where do stars come from? • Stars form in a cloud of dust and gas in space called a nebula.
How do stars form? 1. A force from outside the nebula causes the cloud to condense into stars. – Example: a shockwave 2. Gravity causes the particle in the cloud to contract. – This causes and increase in temperature.
3. As the cloud becomes larger and its temperature increases, certain parts of the cloud will begin to glow. 4. The glowing sections of a cloud are called stars.
What are stars made of? • Hydrogen – 69% • Helium – 29% • Heavy Metals and other gasses (oxygen, carbon, nitrogen, sodium) – 1 -2%
How hot are stars? • We can tell the approximate temperature of a star by looking at its color. • 30, 000°C = Blue • 3, 000°C = Red • Our Sun = 5, 500°C
Key terms related to star distance: • Parallax – the apparent shift in star position. • Astronomical Unit (AU) – the mean distance between the Earth and the Sun. (150 million km or 93 million miles) • Light Year – the distance light travels in one year. (9. 5 trillion km)
Key terms related to star distance: • Apparent Magnitude – how bright a star appears to be to an observer on Earth (adjusted to the value it would have in the absence of the atmosphere). The lower the magnitude, the brighter the star. Our sun is 26. 7 apparent magnitude. • Absolute Magnitude – the brightness of a star if the star where the same distance from Earth.
Key terms related to star distance: • Luminosity – the brightness of a star, due to energy given off. • Seasonal Constellations – constellations change position in the night sky throughout the year due to Earth’s movement around the sun. – Orion = seen in winter – Lyra = seen in summer
Life Cycle of Stars Increasing Time Nebula Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Nebula A dark cloud of dust and gas.
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Protostar • Forms at the center of a shrinking spinning nebula
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Main-Sequence Stars • Second, longest and most stable stage in the life of a star.
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Red Giant • Third Stage, star expands greatly and cools • 10 times bigger than the sun
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Red Supergiants • Third stage, star expands greatly and cools. • 100 times bigger than the Sun
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
White Dwarfs • Small, hot, dim star.
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Black Dwarf • Dead stars • None actually found in existence.
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Supernova • The explosion of a star. – Most famous = 1987, Large Magellanic Cloud. The explosion produced subatomic particles called neutrinos. • First recorded by the Chinese in 1054 A. D. – Outer shell became the Crab Nebula – part of Taurus the Bull constellation
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Neutron Star • Mass of remaining material from a supernova explosion. • Can become a pulsar. – Fastest pulsar was 642 times a second. (called millisecond pulsars)
Life Cycle of Stars Nebula Increasing Time Protostar Main-sequence star Red Giant Supergiant White Dwarf Supernova Black Dwarf Neutron Star Increasing Mass Black Hole
Black Holes Called an invisible star. Caused by the strong gravitational pull of the star. Produces no light. Instead they are seen indirectly by the energy given off by a nearby visible star. • Conditions for Black Hole Classification: • • – X-rays must come from an area where one star is visible and another is invisible. – The invisible star must have a mass 3 times larger than the sun. – Telescopes must be able to detect it.
Galaxies • There are billions of galaxies in the universe. • Galaxies contain billions of stars. • Milky Way has around 100 billion stars.
Three Main Types of Galaxies • Spiral • Elliptical • Irregular
Spiral • Central nucleus • Flattened arms of stars that spiral around the nucleus • Contains millions of young stars, gas and dust
Elliptical • Spherical (football shaped) to flattened disks • No arms • No young stars • Very little dust or gas
Irregular • Smaller and fainter than other types of galaxies • Stars are spread out evenly • Very uncommon
Quasars • • Discovered in 1961 Most luminous objects in the universe Most distant objects observed in the universe A star like object that radiates light and radio waves at very high rates. – Scientists believe quasars are whole galaxies in the early stage of development.
Quasar PKS 1127 -145 10 million light years away
Big Bang • All the matter and energy in the universe was concentrated in an extremely small volume. • Approximately 13. 8 billion years ago the Big Bang occurred and forming a large expanding cloud. – Subatomic particles to what exists today. • Most widely accepted theory explaining the formation of the universe
Big Bang (cont. ) • Evidence of the Big Bang – 1929, Edwin Hubble related the origin of the universe to the Doppler Effect – measures the shift in wavelength on the electromagnetic spectrum. • Redshift = bodies are moving away from each other = increase in wavelength – Redshift is happening in the universe now. • Blueshift = celestial bodies are moving towards each other = decrease in wavelength
- Myrrh is mine its bitter perfume
- Come rico come sano
- There are three sizes of schnauzer dog
- Ao* search algorithm
- What does star (for star events) stand for
- Where do stars come from?
- What are the properties used to classify stars
- Properties of main sequence stars
- Key properties of the progenitor star
- Come holy spirit come inflame our souls with love
- Hey come.on
- Come thou fount come thou king lyrics
- Subject + have/has + past participle
- Come come emmanuel son of god appear
- Come mi chiamo?
- Come lord jesus come and be born in our hearts
- Come home come home jesus is calling
- Come mi vedo
- Turn on your radio
- Come mi chiamo come mi chiamo
- Stick past simple
- Come in and sit down
- Come in come in and sit down
- Intensive and extensive properties
- Chemical and physical properties
- Stars nn
- Two stars and a wish template
- When the stars threw down their spears explain
- Stars life cycle in order
- What is the life cycle of a star
- The life and death of stars
- Symbolism
- Waves are produced by stars and galaxies
- Nn stars
- Little and big dipper
- How do scientists classify stars
- What are the characteristics of a star
- Sun is a star
- Shooting stars carol ann duffy critical essay
- Shooting for the stars meaning
- Pnp badge symbolism and meaning
- Hydrostatic equilibrium
- O holy night the stars are brightly shining
- Number the stars vocabulary words with page numbers
- Another word for hesitantly
- What promise did ellen make to annemarie
- The stars
- Heart 2 heart
- Lindamood bell seeing stars lesson plans
- Star with small and medium mass
- H
- Description for stars
- Stars and bars with upper bound