Cepheid Variables: Brightness Over Time

Cepheid Variable Star in Galaxy M100

This NASA Hubble Space Telescope image of a region of the galaxy M100 shows a class of pulsating star called a Cepheid Variable. Though rare, these stars are reliable distance indicators to galaxies. Based on the Hubble observation, the distance to M100 has been measured...

Hubble Snapshots Capture Pulsation Rate of a "Stellar Milepost"

This sequence of images taken with NASA's Hubble Space Telescope chronicles the rhythmic changes in a rare class of variable star (located in the center of each image) in the spiral galaxy M100. This class of pulsating star is called a Cepheid Variable. The Cepheid in this...

The Spiral Galaxy M100

An image of the grand design of spiral galaxy M100 obtained with NASA's Hubble Space Telescope resolves individual stars within the majestic spiral arms. (These stars typically appeared blurred together when viewed with ground-based telescopes.) Hubble has the ability to resolve...

Individual M100 Cepheid

Individual M100 Cepheid

M100 Cepheids

Distance Scale