2 ConstellationA. A grouping of stars (ex. Big Dipper) named after animals, mythological creatures, and everyday objects.
3 4. Constellation. - Today, there are 88 4. Constellation - Today, there are Some constellations you can see year-round, others only in specific seasons.
4 Clusters of StarsStar Cluster- A group of stars that is gravitationally bound to each other- they interact with each other.Binary Stars- two stars that orbit around a common center of mass, and are very close to each other.
5 Stellar DistancesA. Light year - the distance light travels in a year - (it has nothing to do with time) It is 9,500,000,000,000 km Used to show distance to stars
6 Stellar Distances –B. Parallax - the METHOD used to determine the distance to stars The star appears to move because Earth is moving Scientists can look at the angle of apparent movement to determine how far away the star is.
7 Star Color vs. Star Temperature A. Hot Stars- stars that are 30, K or hotter are blue.Medium Stars- stars in the middle range appear yellow.Cool Stars- stars in the 4,000 K or less range are red.