Originally Posted by snowflakeuniverse

Hi Bad Astronomer

You also stated “If there is no acceleration, the plot is a straight line.” (Referring to a velocity verses time graph describing “acceleration”).

This is wrong. I think you responded too quickly to my post to make this obvious mistake. A straight line with a negative slope represents deceleration at a constant rate. A straight line with a positive slope represents constant acceleration. A negative slope with a negative curvature (slope becoming steeper when moving from the abscissa) indicates a deceleration at an increasing rate of deceleration. This is what is indicated by the plot of Type 1asn’s.

Based upon the “Cosmological Team’s” plot, the universe is decelerating faster now than in the past.

Snowflake