The magnolia wood LignoSat is an attempt to make space junk biodegradable. NASA and Japan's space agency (JAXA) could launch it as soon as 2024.
Up to 15 "shooting stars" per hour may be visible in dark skies as the Leonid meteor shower peaks Friday and Saturday (Nov. 17 and 18).
Supermassive black hole Sagittarius A* is spinning nearly as fast as it can, dragging the very fabric of space-time with it and shaping the heart of the Milky Way.
More than 100 observed galaxies are being disrupted and stripped of their outer layers, transforming them into fossil-dense, ultra-compact dwarf galaxies.
In the glare of the sun, an unknown number of near-Earth asteroids move on unseen orbits. A new generation of space telescopes could be our best defense against potential disaster.
New calculations suggest the sun is a few fractions of a percent smaller than previously estimated, and that could change how we study it.
What asteroids pose the greatest risk of hitting Earth, how probable is an impact, and how much destructive power would such collisions have?
If a mile-wide asteroid is discovered hurtling toward Earth, our survival might depend on launching 1,000 spacecraft — or one well-placed nuke.
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