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Rings and Gaps in a Developing Planetary System

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The discovery of an exoplanet has most often resulted from the monitoring of a star's flicker (the transiting method) or its wobble (the radial velocity method). Discovery by direct imagi...

Ionized Molecules Trace Galactic Outflows

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There is a process at work in most galaxies that affects both the central black hole mass as well as the galaxy's global velocity structure and luminosity. Astronomers suspect that feedb...

Measuring White Dwarf Masses with Gravitational Lensing

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Measuring the mass of a celestial body is one of the most challenging tasks in observational astronomy. The most successful method uses binary systems because the orbital parameters of t...

Imaging a Galaxy's Molecular Outflow

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A merger between galaxies can trigger can intense radiation from bursts star formation and from the accretion of gas onto the two supermassive black holes at their centers. Astronomers h...

In Memoriam: Ursula Marvin

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On February 12, 2018, the pioneering geologist Ursula Marvin passed away. Ursula was born and raised in Vermont, and went to college at Tufts, graduating in 1943. She developed at Tufts a...

A Stellar System with Three Super Earths

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Over 3500 extra-solar planets have been confirmed to date. Most of them were discovered using the transit method, and astronomers can combine the transit light curves with velocity wobbl...
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