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Subgiants are stars that are redder and larger than main-sequence stars of the same luminosity.
Giant stars of the same luminosity may therefore have appreciably different masses.
Type Ia supernovae are useful probes of the structure of the universe, since they all have the same luminosity.
The normalized variability amplitude in the hard X-ray band was σRMS ≈ 0.3, which is the same level as that of Seyfert 1 galaxies of the same luminosity ∼ 3×1042 erg s−1 (2–10 keV).
By that very fact the Ego recognizes in the Thou the same luminosity it sees in itself.
Computations in Science Seminar: Daniel Scolnic, "Measuring the size of the Universe with Standard Candles" Astrophysicists use standard candles, objects which have roughly the same luminosity, to infer distances to far-away parts of the universe.
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In a series of papers in the 1990s the survey showed that while Type Ia supernovae do not all reach the same peak luminosity, a single parameter measured from the light curve can be used to correct unreddened Type Ia supernovae to standard candle values.
Because all the type-Ias explode in roughly the same way and with the same brightness, physicists can use their apparent luminosity in the sky to figure out their distance, age, and speed.
Ms. O'Hara brings to the stage the same quiet luminosity she brought to Nellie Forbush, in a slightly more somber hue.
Hubble was able to spot the most distant Type Ia supernova – a type of exploding star believed to always have the same intrinsic luminosity.
But the greatest horror in Speed Racer is an insanely strident palette, in which everything radiates with the same chemical luminosity.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com