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Small Magellanic Cloud
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The Small Magellanic Cloud is a dwarf galaxy near the Milky Way. Classified as a dwarf irregular galaxy, the SMC has a D25 isophotal diameter of about 5.78 kiloparsecs, and contains several hundred mi
The Small Magellanic Cloud (Source: Digitized Sky Survey 2)
The Small Magellanic Cloud (Source: Digitized Sky Survey 2)
Panoramic Large and Small Magellanic Clouds as seen from ESO's VLT observation site. The galaxies are on the left side of the image.
Panoramic Large and Small Magellanic Clouds as seen from ESO's VLT observation site. The galaxies are on the left side of the image.
VISTA's view of the Small Magellanic Cloud. 47 Tucanae (NGC 104) is visible to the right of the Small Magellanic Cloud.
VISTA's view of the Small Magellanic Cloud. 47 Tucanae (NGC 104) is visible to the right of the Small Magellanic Cloud.
The Milky Way Galaxy
The Milky Way Galaxy
Period-luminosity relation
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In astronomy, a period-luminosity relation is a relationship linking the luminosity of pulsating variable stars with their pulsation period. The best-known relation is the direct proportionality law h
Plot from Leavitt's 1912 paper. The horizontal axis is the logarithm of the period of the corresponding Cepheid, and the vertical axis is its apparent magnitude. The lines drawn correspond to the stars' minimum and maximum brightness.
Plot from Leavitt's 1912 paper. The horizontal axis is the logarithm of the period of the corresponding Cepheid, and the vertical axis is its apparent
Phase lightcurve of variable star Delta Cephei.
Phase lightcurve of variable star Delta Cephei.