Stars
What are the 3 types of galaxies?
Spiral, Elliptical, Irregular
How many earth's could fit into the Sun?
about 1 million
An eclipse where the Moon moves into the Earth's shadow
lunar eclipse
A large ball of gas giving off its own light
a star
What two elements are at the core of all stars?
hydrogen and helium
Our sun is not the largest star or the brightest star. What are the 3 factors that determine a star's magnitude?
size, temperature, distance from earth
Galileo was called the father of modern science. Share with us 2 reasons why...
things he discovered/invented
Sun and all objects orbiting around it
solar system
Really hot stars are __________________ in color and cooler stars are ______________________ in color.
Blue-white, red
Galileo believed in a helio centric model of our solar system...what did he believe about earth?
earth is not the center...sun is the center of our solar system
What is the difference between rotation and revolution?
One is a complete orbit around an object, while the other is a full spin on its axis.
This is where all stars are formed.
Nebula
About 90% of the stars, including the sun, are in this phase because they fuse hydrogen into helium as their fuel source
Main sequence stars
Why do we need telescopes in space?
To avoid Earth's atmosphere and have a clearer picture
Name two tools of early astronomers
telescope, astrolabe, sextant
The center of our galaxy is known to be a what?
Black hole
A graph plotting each star's brightness against its temperature is a _______________________________
Hertzsprung-Russell diagram or HR diagram
What did early humans leave behind to show us they studied the sky and stars?
buildings and structures