42,000 years ago, a breakdown in Earth’s magnetic field led to environmental catastrophes and mass extinctions. Source: https://earthsky.org/earth/magnetic-field-reversal-42000-years-ago-neanderthal-extinction…
Tag: sunscreen
2020 Antarctic ozone hole among largest, deepest in recent years
This year’s ozone hole covers most of the Antarctic continent and is among the largest and deepest in recent years. Source: https://earthsky.org/earth/antarctic-ozone-hole-2020-among-largest-deepest-in-recent-years…
Hubble uses Earth as proxy for identifying oxygen on potentially habitable exoplanets
Taking advantage of a total lunar eclipse, astronomers using NASA’s Hubble Space Telescope have detected Earth’s own brand of sunscreen—ozone—in our atmosphere. This method simulates how astronomers and astrobiology researchers will search for evidence of life beyond Earth by observing potential “biosignatures” on exoplanets (planets around other stars). Source: https://phys.org/news/2020-08-hubble-earth-proxy-oxygen-potentially.html…
It’s summer. What’s noon to you?
What do you mean by noon? Do you define it by your clock or wristwatch? Or the gnawing in your stomach? Here’s how astronomers think about noontime. Source: https://earthsky.org/earth/its-summer-whats-noon-to-you…
Contact lens senses UV light to tell you when it’s time for sunscreen
Skin patches and contact lenses that change colour when exposed to UV light could provide us with a visual alert to apply sunscreen or seek some shade Source: https://www.newscientist.com/article/2232082-contact-lens-senses-uv-light-to-tell-you-when-its-time-for-sunscreen/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home…
Why leaves change color in fall
The vivid yellows and oranges of autumn leaves are there throughout spring and summer, but hidden. Source: https://earthsky.org/earth/why-do-tree-leaves-turn-red-in-fall…
Safety of many sunscreen ingredients is in doubt – should we worry?
The US body that regulates sunscreen has declared that 12 of the 16 popular active ingredients might not actually be safe. Here’s what you need to know Source: https://www.newscientist.com/article/mg24332405-200-safety-of-many-sunscreen-ingredients-is-in-doubt-should-we-worry/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home…