Three Cepheid variable stars, pulsating stars used to measure distance and age of objects, are visible in this view of the heart of the Milky Way. This image was taken using the South African Astronomical Observatory and released Aug. 24, 2011.

Three Cepheid variable stars, pulsating stars used to measure distance and age of objects, are visible in this view of the heart of the Milky Way. This image was taken using the South African Astronomical Observatory and released Aug. 24, 2011.

What are Cepheid variables?

What are Cepheid variables? - Windows to the Universe

Cepheid Variable Star RS Puppis. public domain space images from NASA

This festive NASA Hubble Space Telescope image resembles a holiday wreath made of sparkling lights. The bright southern hemisphere star RS Puppis, at the center of the image, is swaddled in a gossamer cocoon of reflective dust illuminated by the.

UNRULY UNIVERSE  Different methods for measuring the universe’s expansion rate disagree. To make one such measurement, scientists observed Cepheid variable stars and a type 1a supernova in the spiral galaxy UGC 9391 (shown), located 130 million light-years away in the constellation Draco. ~~ NASA, ESA, L. Frattare/STScI

Debate accelerates on universe’s expansion speed

The Universe Is Expanding Faster Than Scientists Thought ~ This Hubble Space Telescope image shows Cepheid variable stars (circled in red) and a Type Ia supern. - NASA, ESA, and A.

M25 and measuring the distance to stars Professor Merrifield discusses motorways and stars - but says only a little about Messier 25 itself! Includes discussion of the Baade-Wesselink Method and cepheid variable stars. By: Deep Sky Videos.

and measuring the distance to stars Professor Merrifield discusses motorways and stars - but says only a little about Messier 25 itself! Includes discussion of the Baade-Wesselink Method and cepheid variable stars. By: Deep Sky Videos.

Mikko Sinervo  ||  Cepheid Variable I 2011 Archival pigment print

Mikko Sinervo || Cepheid Variable I 2011 Archival pigment print

Delta Cephei is a famous variable star By Bruce McClure & Deborah Byrd  At the southeast corner of the constellation Cepheus the King, there is an intriguing variable star called Delta Cephei. With clocklike precison, this rather faint star doubles in brightness and fades again every 5.36 days. Like lights in a dark tunnel. They pulsate at a particular rate always correlated to their intrinsic brightnesses, Cepheid variable stars reveal their true distances.

Delta Cephei is a famous variable star, it doubles in brightness every days. This star and others like it have helped establish the known scale of our galaxy and universe. - Image via The Last Word on Nothing

11 Scientific advances of the last 100 years gave us our entire Universe    Hubble’s discovery of a Cepheid variable in Andromeda galaxy, M31, opened up the Universe to us. Image credit: E. Hubble, NASA, ESA, R. Gendler, Z. Levay and the Hubble Heritage Team. Image credit: E. Hubble, NASA, ESA, R. Gendler, Z. Levay and the Hubble Heritage Team.

11 Scientific advances of the last 100 years gave us our entire Universe

11 Scientific advances of the last 100 years gave us our entire Universe Hubble’s discovery of a Cepheid variable in Andromeda galaxy, M31, opened up the Universe to us. Image credit: E. Hubble, NASA, ESA, R. Gendler, Z. Levay and the Hubble Heritage Team. Image credit: E. Hubble, NASA, ESA, R. Gendler, Z. Levay and the Hubble Heritage Team.

How big is the Milky Way? There's no easy answer, but Cepheid variable stars are helping astronomers see what our galaxy looks like from within.

How big is the Milky Way? There's no easy answer, but Cepheid variable stars are helping astronomers see what our galaxy looks like from within.

RS Puppis - a type of variable star known as a Cepheid variable.  2013 Hubble Space Telescope Advent Calendar - In Focus - The Atlantic

2013 Hubble Space Telescope Advent Calendar - In Focus - The Atlantic Star RS Puppis has a 'light echo'

#sciart Astronomer Henrietta Swan Leavitt discovered the relationship between period and luminosity for cepheid variable #stars setting the scale of our universe. She's shown with a plot of how luminosity varies with time for the stars  of the Cepheus #constellation. My 3 year old insists this is in fact a self-portrait  it's Mommy! #womeninstem #histstm #astronomy #astronomer

#sciart Astronomer Henrietta Swan Leavitt discovered the relationship between period and luminosity for cepheid variable #stars setting the scale of our universe. She's shown with a plot of how luminosity varies with time for the stars of the Cepheus #constellation. My 3 year old insists this is in fact a self-portrait it's Mommy! #womeninstem #histstm #astronomy #astronomer

HubbleSite - Picture Album.NGC 4603 Observations of a type of pulsing star called a Cepheid variable in this galaxy helped astronomers using Hubble precisely measure the expansion rate of the universe. Researchers found 36-50 Cepheid variable stars in NGC 4603. This is the most distant galaxy in which Cepheid variables have been found. See more info at site.

HubbleSite - Picture Album.NGC 4603 Observations of a type of pulsing star called a Cepheid variable in this galaxy helped astronomers using Hubble precisely measure the expansion rate of the universe. Researchers found 36-50 Cepheid variable stars in NGC 4603. This is the most distant galaxy in which Cepheid variables have been found. See more info at site.

Artist's impression of an eclipsing binary system that including a pulsating star called a Cepheid variable. Researchers have recently discovered a new type of variable star that pulsate in two frequencies, the ratio of which is surprising close to the famous "divine proportion."

Artist's impression of an eclipsing binary system that including a pulsating star called a Cepheid variable. Researchers have recently discovered a new type of variable star that pulsate in two frequencies, the ratio of which is surprising close to the fa

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