Compass Image of Large Magellanic Cloud

Large Magellanic Cloud (DSS View) with Star Cluster Overlay (Hubble)

Astronomers Use Hubble to Tighten the Cosmic Distance Ladder This is a ground-based telescope's view of the Large Magellanic Cloud, a satellite galaxy of our Milky Way. The inset image, taken by the Hubble Space Telescope, reveals one of many star clusters scattered throughout...

Three Steps to the Hubble Constant

This illustration shows the three basic steps astronomers use to calculate how fast the universe expands over time, a value called the Hubble constant. All the steps involve building a strong "cosmic distance ladder," by starting with measuring accurate distances to nearby...