ASTR 101 Lecture Notes - Lecture 2: Laniakea Supercluster, Local Group
Document Summary
What characteristics are important for life: planets represent less than 0. 2% of the total mas in the solar system. The sun represents the other 99. 8: all other stars are so far away that they only appear as points. Only the brightest are visible to the naked eye. Andromeda and the milky way are over a billion times larger than the. Solar system: galaxies congregate in groups and clusters. Clusters congregate in superclusters: the milky way is in the laniakea supercluster, superclusters are the biggest coherent structures in the universe, we see no larger objects or galaxies beyond 13 billion light years. Beyond that, we only see smooth radiation from a time before stars and planets existed (big bang: laniakea supercluster > the local group > the milky way > the solar system >
