Astronomers Detect Signs of an Atmosphere Stripped from a Planet in a Giant Impact

Illustration showing a glowing, fiery planet impacting a larger gray planet
An MIT-led team has discovered evidence of a giant impact in the nearby HD 17255 star system, in which an Earth-sized terrestrial planet and a smaller impactor likely collided at least 200,000 years ago, stripping off part of one planet’s atmosphere.
Credits:Image: Mark A. Garlick

Young planetary systems generally experience extreme growing pains, as infant bodies collide and fuse to form progressively larger planets. In our own solar system, the Earth and moon are thought to be products of this type of giant impact. Astronomers surmise that such smashups should be commonplace in early systems, but they have been difficult to observe around other stars.

Now astronomers at MIT, the National University of Ireland at Galway, Cambridge University, and elsewhere have discovered evidence...

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Drug helps Sensory Neurons Regrow in the Mouse Central Nervous System

Sensory neurons regrow more after injury when treated with the drug fenofibrate (lower panel) than when given a placebo (top panel; arrows indicate site of injury). Researchers at Washington University School of Medicine in St. Louis have discovered that an FDA-approved drug acts on support cells in the central nervous system to encourage sensory neurons to regrow after injury. Credit: RUI FENG

Targeting support cells with cholesterol drug could improve recovery after spinal cord injury. Researchers have discovered that an FDA-approved drug acts on support cells in the CNS to encourage sensory neurons to regrow after injury.

A spinal cord injury damages the lines of communication between the body and brain, impeding the signals that drive movement and sensation...

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Lightweight Electric Wristband Heaters for Constant, Portable Warmth

Infrared image of active wristband heater
An electrically conductive and durable yarn was sewn onto fabric and became a wearable heater (high temperatures indicated by yellows and reds) when a safe voltage was applied.
Credit: Adapted from ACS Applied Materials & Interfaces 2021, DOI: 10.1021/acsami.1c13329

As the fall chill settles in across the U.S., people are getting out their cozy sweaters and electric blankets, or stocking up on handheld heat packets for extra warmth. But sweaters and blankets are bulky, and heat packs only work for a little while. Now, researchers reporting in ACS Applied Materials & Interfaces demonstrate a conductive, durable yarn for lightweight wearable heaters that are re-usable and provide constant, portable warmth.

Lightweight wearable heaters with heating elements embedded within the fabric co...

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In Earth’s Highest Atmospheric Layers, space weather can really heat things up

The thermosphere is the highest and hottest atmospheric layer, where the ISS flies and the aurora and airglow can be observed. Credits: NASA’s Goddard Space Flight Center/Genna Duberstein

New results from NASA satellite data show that space weather—the changing conditions in space driven by the sun—can heat up Earth’s hottest and highest atmospheric layer.

The findings, published in July in Geophysical Research Letters, used data from NASA’s Global Observations of the Limb and Disk, or GOLD mission. Launched in 2018 aboard the SES-14 communications satellite, GOLD looks down on Earth’s upper atmosphere from what’s known as geosynchronous orbit, effectively “hovering” over the western hemisphere as Earth turns...

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