Andere Kunden interessierten sich auch für
![Barnard's Star]( "Barnard's Star")
Barnard's Star25,99 €![Debris disk]( "Debris disk")
Debris disk22,99 €![Gliese 581 d]( "Gliese 581 d")
Gliese 581 d22,99 €![Gas Giant]( "Gas Giant")
Gas Giant51,99 €![Gliese 876 d]( "Gliese 876 d")
Gliese 876 d22,99 €![The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds]( "The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds")
The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds37,99 €![The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds]( "The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds")
The Earliest Stages of Massive Clustered Star Formation: Fragmentation of Infrared Dark Clouds37,99 €
A star is classified as variable if its apparent brightness as seen from Earth changes over time, whether the changes are due to variations in the star's actual luminosity, or to variations in the amount of the star's light that is blocked from reaching Earth. Many, possibly most, stars have at least some variation in luminosity: the energy output of our Sun, for example, varies by about 0.1% over an 11 year solar cycle, equivalent to a change of one thousandth of a magnitude. Astronomers use the term millimagnitude, abbreviated as mmag, for one thousandth of a magnitude.