Lightyear Notes
- Light year is a measurement of distance (the distance light travels in a year)
- Light's speed = 300,000 kilometers/second
- 1 light year = 9.5 trillion kilometers or 5.9 trillion miles
Travis travels .005 km/sec
Bhavana travels .003 km/sec
Travis travels 157,680 km/yr
Bhavana travels 94,607 km/yr
Bhavana travels .003 km/sec
Travis travels 157,680 km/yr
Bhavana travels 94,607 km/yr
Galaxy Notes
- groups of stars, gases, and dust held together by gravity
- Clusters: galaxies that travel together
- 3 main type: spiral, elliptical, and irregular
Spiral
-Characterized by a bulge at the center and spiral arms
-Spiral shape is caused by the rotation of the galaxy
-Milky way is a spiral galaxy
Irregular
-Galaxies that do not fit into any other class
-As their name indicates they have irregular shapes
Elliptical
-Characterized by very bright centers and very little dust and gas
-Appear elongated or spherical and are basically massive blobs of stars
-Composed of mostly old stars
-Characterized by a bulge at the center and spiral arms
-Spiral shape is caused by the rotation of the galaxy
-Milky way is a spiral galaxy
Irregular
-Galaxies that do not fit into any other class
-As their name indicates they have irregular shapes
Elliptical
-Characterized by very bright centers and very little dust and gas
-Appear elongated or spherical and are basically massive blobs of stars
-Composed of mostly old stars