Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
What is a star |
A star is a massive, luminous sphere of plasma held together by gravity |
|
|
What is the nearest star to earth and and what is it a source of |
The nearest star to earth is the sun, which is the source of most energy on the planet. |
|
|
Almost all naturally occurring elements heavier than what are created by stars |
Helium |
|
|
The closest star to us is how many light-years away |
4.3 light years away |
|
|
Light travels at how many miles per second |
186,282 mi./s |
|
|
What is a light year |
A light year is a measure of distance that is defined by how far light travels in a year |
|
|
What are the three different types of star systems |
Binary star system, open star clusters, globular star clusters |
|
|
What is a binary star system |
A binary star system is a star system consisting of two stars orbiting A round their common center of mass. |
|
|
What is the Bright star called and the other star |
Primary, companion star |
|
|
What is an open star cluster |
And open star cluster is a group of up to a few thousand stars |
|
|
What is a globular star cluster |
A globular star cluster is a spherical collection of stars that orbit a galactic core as a satellite. |
|
|
What is a nebula |
Is a interstellar cloud of dust, hydrogen, helium and other ionized gases |
|
|
A nebula is where is stars are what |
Formed. |
|
|
What is an nebulae |
Nebulae are the remnants of dead stars. |
|
|
What is a galaxy |
A galaxy is a massive, gravitationally bound System consisting of stars. |
|
|
What is the name of our galaxy |
The Milky Way. |
|
|
What is the closest galaxy to us |
Andromeda |
|
|
What is a galaxy cluster |
A galaxy cluster is a structure that consist of many galaxies bond together by gravity. |
|
|
What is a supercluster |
Superclusters are even larger collections of galaxies bond together by gravity. |
|
|
What is Galactic Filaments |
Huge superclusters combined to form galactic filaments. |
|
|
What is the difference between the universe, and the observable universe? |
The universe is everything that exist, the observable universe is what we can see. |
|
|
What are the three types of galaxies and what do they do |
First is the Elliptical, having in approximately elliptical shape and a smooth, nearly featureless brightness profile. Next is the spiral, flat, rotating disk containing stars, gas and dust, and a central concentration of star is known as the bulge. Last, is the irregular, Galaxy with no distinct shape like a spiral or elliptical |
