Ice Volcanoes Reshape Pluto and Hint at a Hidden Ocean

Signs of cryovolcanic activity on the dwarf planet in the recent geological past must be driven by an underground body of water, a study suggests.

#ice, #nature-communications-journal, #pluto-dwarf-planet, #research, #space-and-astronomy, #volcanoes

Ross Douthat’s Change of Heart About Health Care

Readers discuss a column about how a bout of sickness has changed some of his beliefs. Also: Changes in the SAT; Covid ethics; 8 planets and Pluto.

#college-board, #coronavirus-2019-ncov, #douthat-ross-g, #health-insurance-and-managed-care, #planets, #pluto-dwarf-planet, #sat-college-admission-test, #vaccination-and-immunization

Give Thanks for the Winter Solstice. You Might Not Be Here Without It.

The scientific start of winter offers a moment to reflect on how we might not be here to witness the changing seasons without Earth’s particular tilt toward the sun.

#earth, #pluto-dwarf-planet, #seasons-and-months, #space-and-astronomy, #sun, #uranus-planet, #venus-planet, #winter-season

Oumuamua: It Came From Another Solar System

A piece of an extrasolar Pluto may have passed through our cosmic neighborhood, a new study suggests.

#comets, #journal-of-geophysical-research-planets, #nitrogen, #pluto-dwarf-planet, #solar-system, #space-and-astronomy, #stars-and-galaxies, #telescopes-and-observatories, #your-feed-science

Never Mind the Summer Heat: Earth Is at Its Greatest Distance From the Sun

During aphelion, our planet receives 7 percent less sunlight than in January, but changes in the planet’s orbit are not what causes our seasons.

#earth, #mars-planet, #pluto-dwarf-planet, #seasons-and-months, #sun