The Moon's magnetic field was much stronger than it is today for longer than previously thought (alt link):
New evidence from ancient lunar rocks suggests that an active dynamo once churned within the molten metallic core of the moon, generating a magnetic field that lasted at least 1 billion years longer than previously thought. Dynamos are natural generators of magnetic fields around terrestrial bodies, and are powered by the churning of conducting fluids within many stars and planets.
In a paper published today in Science Advances, researchers from MIT and Rutgers University report that a lunar rock collected by NASA's Apollo 15 mission exhibits signs that it formed 1 to 2.5 billion years ago in the presence of a relatively weak magnetic field of about 5 microtesla. That's around 10 times weaker than Earth's current magnetic field but still 1,000 times larger than fields in interplanetary space today.
Several years ago, the same researchers identified 4-billion-year-old lunar rocks that formed under a much stronger field of about 100 microtesla, and they determined that the strength of this field dropped off precipitously around 3 billion years ago. At the time, the researchers were unsure whether the moon's dynamo — the related magnetic field — died out shortly thereafter or lingered in a weakened state before dissipating completely.
The results reported today support the latter scenario: After the moon's magnetic field dwindled, it nonetheless persisted for at least another billion years, existing for a total of at least 2 billion years.
A two-billion-year history for the lunar dynamo (open, DOI: 10.1126/sciadv.1700207) (DX)
(Score: 3, Interesting) by takyon on Sunday August 13 2017, @07:40PM
There is the possibility of a Mars-sized object at the edge of the Kuiper belt [arizona.edu]:
The known KBO population is about to expand greatly [space.com]:
Many of those objects will be much smaller than Pluto, but some of the more distant ones with darker albedos may be larger.
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]