Show:
The Sun
Stars
Life Cycles of Stars
Groups of Stars
The Expanding Universe
100
What are some of the suns features?
sunspots, prominences, and solar flares
100
What is called the apparent change in the position of an object with respect to a distant background?
Parallax
100
What is the definition of a supernova?
An explosion so violent that the dying star becomes more briliant then the entire galaxy
100
What are the three basic kinds of star clusters?
Open clusters Associations Globular Clusters
100
What does Hubbles Law state?
It states that the speed at which a galaxy is moving away is proportional to its distance from us.
200
How does the sun produce energy?
it is produced in its central region by the fusion of hydrogen nuclei into helium nuclei
200
A star's color indicates the temperature of its surface. True or False?
True
200
What is a planetary nebula?
a dying star surrounded by a cloud of gas.
200
What are the 4 types galaxies?
Spiral Barred-spiral Elliptical Irregular
200
What is the big bang theory?
A theory that states that the universe began in an instant, billions of years ago, in an enormous explosion.
300
Why does the sun remain stable over time?
because of the inward pull of gravity balances the outward pressure of thermal pressure
300
The smal , dense remains of low-or medium-mass star are called:
White Dwarf
300
How do stars form?
A star is formed when a contracting cloud of dust becomes so dense and hot that nuclear fusion begins.
300
How old did astronomers estimate the oldest globular clusters are?
12 billion years old
300
What is a red shift?
This is the light of galaxies that is shifted toward the red wavelengths...this shows that nearly all galaxies are getting farther away from earth
400
What is the structure of the sun?
Interior consists of: core radiation zone convection zone
400
Which stars are much btighgter than main-sequence stars?
Supergiants
400
Which type of star cluster has the greatest percentage of old stars?
Globular clusters
400
How do arstronomers know that the universe is expanding?
The observed red shift in the spectra of galaxies shows that the universe is expanding
500
What are the suns layers and how many are there?
3 layers: photosphere chromosphere the corona
500
Where the most of the stars are found along a diagonal band?
Main-Sequence Stars
500
How many times brighter is a blue star then the Sun?
Blue stars are typically 300,000 times brighter than the Sun.
500
What makes a quasar so bright?
The most likely explanation involves matter spiraling into super-massive black hole with the mass of a billion suns
500
How can dark matter be detected?
Dark matter cannot be seen directly, but its presence can be detected by observing its gravitational effects on visible matter.