Will Smith and his son Kitai are back in this highly anticipated, totally unexpected sequel and this time, they’ve crash landed on a Super-Earth. Surviving won’t be easy, but it might be even harder for the planet’s atmosphere.
Astronomers may have finally observed the event that explains polluted white dwarfs and their debris disks.
This is less a physical question than a moral one. Should we feed a black hole? If we do, will it ever learn to feed and fend for itself independently? Will it ever truly be able to return to the wild, or will it ever after be chained to the yoke of domestic comfort?
Earth’s composition seemingly does not fit into planet formation theory. Ripping apart its building blocks by collisions during accretion might sound violent, but can be a way to go.
How to form clumps in the intermediate ranges of massive protoplanetary disks? Could these later be planets?
A model that needs fewest parameters to explain a scenario is favourable. The fact that mm-size dust grains (chondrules) are present in the entire solar system brings rise to the question, whether all bigger solid objects are a collection of chondrules.