October 14, 1999 CfA Colloquium

Title: The Cosmic Triangle

Speaker: Neta Bahcall

Abstract: The Cosmic Triangle is introduced as a way of representing the past, present, and future of the universe. Our current location within the Cosmic Triangle is determined by the answers to three questions: How much matter is in the universe? Is the expansion rate slowing down or speeding up? And, is the universe flat? A review of recent observations suggests a universe that is lightweight (matter density about one-third the critical value), is accelerating, and is flat. The acceleration, if confirmed by future observations, implies the existence of cosmic dark energy that overcomes the gravitational self-attraction of matter and causes the expansion to speed up.

Student Lunch: Thursday 10/14 at 12:00 in A-101

Further Reading: