NASA's Space to Ground is your weekly update on what's happening aboard the International Space Station.
An unknown, unseen "planetary mass object" may lurk in the outer reaches of our solar system
4.5 billion years ago in the violent, high-speed environment of the early solar system, a protoplanet roughly the size of Mars was involved in a series of fierce collisions with other large planetary bodies.
At any given moment, as many as 10 million wild jets of solar material burst from the sun's surface.
Finding such a galaxy early in the history of the universe challenges the current understanding of how massive galaxies form and evolve, say researchers.
Cyclone Donna was photographed just east of Australia as the International Space Station orbited about 250 miles above.
