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How to destroy a debris disk

Planet-planet scattering can either be a good thing or a bad thing for the planetesimals caught in the crossfire. Like many things in life, the key is moderation. The authors of this paper try to figure out how many exoplanet systems with eccentric planets are likely to still have their debris disks after experiencing a planet-planet scattering event.

Can Planets Maintain Vega’s Debris Disks?

Vega’s system of debris disks can be explained by a series of planets that constantly transport material inwards towards the star.

Can Scattering Explain Eccentric Planets?

New dynamical simulations show that close-in planets on eccentric orbits can arise from planet-planet scattering — but only if the scattering occurs on larger orbits and is followed by inward migration.

How to Drag an Asteroid to Earth

With some assistance from gravity, it is possible with currently-available technologies to bring small asteroids into orbit next to Earth to be studied and mined.

Seeing Black Holes with a Gas Cloud

The gas cloud G2 is rapidly approaching the galactic center. Can tidal disruption events with stellar remnants help constrain its orbit?

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