The galactic year, also known as a cosmic year, is the duration of time required
for the Sun to ... Timeline of the universe and Earth's history in galactic years.
Main articles: Timeline of cosmological epochs, Timeline of natural history, and ...
2012: Shadow of the Dark Rift | NASA
Dec 21, 2011 ... A cosmic alignment of the sun, Earth, and the center of our galaxy on the winter
solstice happens every year without event, and poses no ...