![A loose grouping of a few thousand
stars is called a(n)
• OPEN CLUSTER
An open cluster is a group of up to a few thousand stars that were formed from the
same giant molecular cloud and have roughly the same age. More than 1,100 open
clusters have been discovered within the Milky Way Galaxy, and many more are
thought to exist.[1] They are loosely bound to each other by mutual gravitational
attraction and become disrupted by close encounters with other clusters and clouds of
gas as they orbit the galactic center, resulting in a migration to the main body of the
galaxy as well as a loss of cluster members through internal close encounters.[2] Open
clusters generally survive for a few hundred million years. In contrast, the more
massive globular clusters of stars exert a stronger gravitational attraction on their
members, and can survive for many billions of years. Open clusters have been found
only in spiral and irregular galaxies, in which active star formation is occurring.[3]](https://image.slidesharecdn.com/ch3studyguide2012-131121085306-phpapp02/85/Ch-3-study-guide-2012-18-320.jpg)
Ch 3 study guide 2012
- 1. The Milky Way galaxy is an example of a(n) SPIRAL GALAXY ://science.howstuffworks.com/mil ky-way4.htm
- 2. All stars begin as part of a large cloud of gas and dust called a(n) ____________________. • NEBULA A nebula (from Latin: "mist"; pl. nebulae or nebulæ, with ligature or nebulas) is an interstellar cloud of dust, hydrogen gas and plasma. It is the first stage of a star's cycle. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way (some examples of the older usage survive; for example, the Andromeda Galaxy was referred to as the Andromeda Nebula before galaxies were discovered by Edwin Hubble). Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most famous images, the "Pillars of Creation". In these regions the formations of gas, dust and other materials 'clump' together to form larger masses, which attract further matter, and eventually will become big enough to form stars. The remaining materials are then believed to form planets, and other solar system objects.
- 3. Parallax is used to determine a star’s • DISTANCE http://physics.syr.edu/ courses/CCD_NEW/se ti/tutorial/measure/p art5.html
- 4. The force that pulls together the matter in stars is… http://science.howstuffworks.com/environmental/earth/geophysics/question232.htm
- 5. The strength of the force of gravity depends on….. • Mass and distance
- 6. The brightness of a star as seen from Earth is its _________ brightness. • APPARENT
- 7. Depending on its mass, a star may live from about a.1 million to 10 million years. b.10 million to 200 billion years. C. 5 million to 100 million years. • Depending on its mass, a star may live from about • b.10 million to 200 billion years. Click here to learn more!!
- 8. Write 476,000,000,000,000 km in scientific notation • It’s EASY! Just make the BIG number smaller by making it a number between 1-9 (with decimals if needed) and write down your power of 10 (the number of times you moved the decimal) • 4.76 x 10¹⁴ • click here for scientific notation help
- 9. Astronomers typically measure distances to stars in units called ______________ • Light years Cool Fact A light nanosecond -- the distance light can travel in a billionth of a second -- is about 1 foot (about 30 cm). Radar uses this fact to measure how far away something like an airplane is. A radar antenna sends out a short radio pulse and then waits for it to echo off an airplane or other target. While it's waiting, it counts the number of nanoseconds that pass. Radio waves travel at the speed of light, so the number of nanoseconds divided by 2 tells the radar unit how far away the object is! click here for light year info
- 10. What color are the coolest stars? •RED
- 11. Gravity helps form stars, planets, and solar systems by the gradual gathering together of smaller pieces in a process called ACCRETION
- 12. If you are in a car that stops suddenly, your body keeps moving because it has ____________________. • INERTIA
- 13. Stars with less mass will last longer or shorter than stars with more mass. • LESS MASS = LONG LIFE
- 14. Magnetic storms are a result of an increase in solar wind caused by eruptions on the sun called____________. • Solar flares solar flare solar flare video
- 15. Characteristics used to classify stars include • Temperature • brightness
- 16. The most massive stars collapse to form ____________ when they die. • BLACK HOLES black hole questions
- 17. Which two factors did Newton concluded combine keeping Earth in orbit? • MASS and inertia (VELOCITY)
- 18. A loose grouping of a few thousand stars is called a(n) • OPEN CLUSTER An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist.[1] They are loosely bound to each other by mutual gravitational attraction and become disrupted by close encounters with other clusters and clouds of gas as they orbit the galactic center, resulting in a migration to the main body of the galaxy as well as a loss of cluster members through internal close encounters.[2] Open clusters generally survive for a few hundred million years. In contrast, the more massive globular clusters of stars exert a stronger gravitational attraction on their members, and can survive for many billions of years. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring.[3]
- 19. A light-year is ______________ • The distance light travels on one year. • 1 light year = 5.87849981 × 1012 miles • Let’s move that decimal and find out how many miles it REALLY is… • 5,878,499,810,000 miles <iframe width="640" height="360" src="http://www.youtube.com/embed/Rj1sDWj vgjM?feature=player_detailpage" frameborder="0" allowfullscreen></iframe>
- 20. A spinning neutron star is called a(n) __________________. • PULSAR A neutron star is about 20 km in diameter and has the mass of about 1.4 times that of our Sun. This means that a neutron star is so dense that on Earth, one teaspoonful would weigh a billion tons! Because of its small size and high density, a neutron star possesses a surface gravitational field about 2 x 1011 times that of Earth. Neutron stars can also have magnetic fields a million times stronger than the strongest magnetic fields produced on Earth. http://imagine.gsfc.nasa.gov/docs/science/know_l1/pulsars.html
- 21. Oh my gosh, I heard that astronomers found life on another planet!!!! Really?! That’s amazing! Professor Von Drake said he found fleas on Pluto!!!! STUDY!!!