Possible Models of the Expanding Universe

Distant Spiral Galaxy NGC 4603, Home to Variable Stars

A NASA Hubble Space Telescope (HST) view of the magnificent spiral galaxy NGC 4603, the most distant galaxy in which a special class of pulsating stars called Cepheid variables have been found. It is associated with the Centaurus cluster, one of the most massive assemblages of...

Spiral Galaxy NGC 4603

Spiral Galaxy NGC 4603 With Location of Cepheids Marked

Cepheid 1 NGC 4603

Cepheid 2 NGC 4603

Cepheid 3 NGC 4603

Cepheid 4 NGC 4603

Ground-Based Image of Supernova 1994D in Galaxy NGC 4526

Supernova 1994D in Galaxy NGC 4526

Hubble Diagram for Cepheids

Hubble Diagram for Cepheids This is a plot of galaxy distance versus the velocity that the galaxy appears to be receding from Earth. It is based on data collected by the Hubble Space Telescope Key Project team. The distances have been measured using Cepheid variables. The slope...

Galaxy 4603 with Cepheids Identified, One Cepheid with EFX to Show Brightening

Animation of Cepheid Stars in Galaxies Showing Distances

Ground-Based Supernova Explosion Data

Animation of Big Bang with Acceleration