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New way to weigh a white dwarf:Use the Hubble Space Telescope
white dwarf Hubble Space Telescope
2017/7/21
Astronomers have used, for the first time, a novel method to determine the mass of a nearby dead star. The star is a "white dwarf," the shrunken corpse of a star like our sun after it has burned up it...
Chemists Weigh Intact Virus Mixture With Mass Spectrometer（图）
Chemists Virus Mixture Mass Spectrometer
2015/6/18
Carnegie Mellon University chemists, led by Mark Bier, have separated and weighed virus particles using mass spectrometry (MS). This is the first time that researchers successfully used matrix-as...
Chemists Weigh Intact Virus Mixture With Mass Spectrometer（图）
Chemists Virus Mixture Mass Spectrometer
2015/6/18
Carnegie Mellon University chemists, led by Mark Bier, have separated and weighed virus particles using mass spectrometry (MS). This is the first time that researchers successfully used matrix-as...
How to Weigh a Star Using a Moon
Earth and Planetary Astrophysics (astro-ph.EP) Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
We show that for a transiting exoplanet accompanied by a moon which also transits, the absolute masses and radii of the star, planet and moon are determinable. For a planet-star system, it is well kno...