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Dr. Dumusque and his colleagues first found the planet by the so-called wobble method — perfected over the years by Michel Mayor and his colleagues at the Geneva Observatory — which measures planets' masses by how much they tug their host star to and fro as they orbit it.
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ALMA also measured planets orbiting the star Fomalhaut and found they were smaller than previously thought.
Observations of transiting systems, which allow us to directly measure planet masses and radii and constrain atmospheric properties, are key to understanding the compositional diversity of the planets in this mass range.
The planet's emissions of infrared light are then measured, as planets are usually brighter in infrared than they are in visible light.
Mario, the mustached Italian plumber he created almost 30 years ago, has become by some measures the planet's most recognized fictional character, rivaled only by Mickey Mouse.
And a magnetometer measures the planet's magnetic field.All four instruments have sent back data that have turned the science of Mars on its head.
By measuring the planet to star flux ratio near opposition, we constrain the geometric albedo of the planet, which is strongly linked to its atmospheric temperature gradient.
Measuring the planet's mass was a somewhat trickier endeavor.
The only way we can measure a planet's mass is through its gravity.
By that measure, the planet as a whole is becoming a fairer place.
Magellan also carried a radar altimeter system that measured the planet's surface topography as well as some properties of its surface materials.
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