Planets of TRAPPIST-1: Complex atmospheres, probably lots of water

Enlarge (credit: ESO/M. Kornmesser ) We’ve now developed a healthy-sized catalog of planets orbiting in the habitable zone of distant stars. But we don’t have the slightest idea whether any of them are actually habitable. That’s largely because, at these distances, it’s extremely difficult to get any sense of what the planets are made of and what their atmospheres are like. And the greenhouse potential of the atmosphere can make the difference between a frozen world like Mars and an out-of-control hothouse like Venus. But at least in the case of one nearby star, scientists are slowly narrowing down the options. TRAPPIST-1 has at least seven planets , all small enough to be Earth-like, with several inside the star’s habitable zone. In two papers released this week, teams of scientists have narrowed down what their atmospheres might look like and provided a greater sense of their composition. The results suggest that at least one planet has the potential to be a watery world. In the air The first study, which appears in Nature Astronomy , looks at the atmospheres of several of the planets, but not directly. Instead, it relies on the Hubble to observe the star’s light as a planet passes in front of it. A tiny fraction of the photons will have passed through the planet’s atmosphere on their way to Earth. Any colors of light that are absorbed or scattered by the gases in the atmosphere will be missing from that fraction, making it possible to infer the atmosphere’s composition. Read 11 remaining paragraphs | Comments

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Planets of TRAPPIST-1: Complex atmospheres, probably lots of water

First-known interstellar visitor is a bizarre, cigar-shaped asteroid

Enlarge / An artist’s impression of the oddly shaped interstellar asteroid `Oumuamua. (credit: ESO/M. Kornmesser ) Since mid-October, the astronomy community has been buzzing about what might be our Solar System’s first confirmed interstellar visitor. An automated telescope spotted an object that appeared as if it had been dropped on the Solar System from above, an angle that suggests it arrived from elsewhere. Now, a team of astronomers has rushed out a paper that describes the object’s odd properties and gives it the name “1I/2017 U1 ‘Oumuamua.” In Hawaiian, ‘Oumuamua roughly means “first messenger,” and the 1I indicates that it’s the first interstellar object. ‘Oumuamua was first spotted on October 19 by the Pan-STARRS1 automated telescope system. Pan-STARRS1 turned out to have captured images of the object the day previously, but the automated analysis software hadn’t identified it. Further images over the next few days allowed researchers to refine its travel through our Solar System, confirming that ‘Oumuamua was making the most extreme approach toward the inner Solar System of any object we’ve ever seen. In essence, it appeared to have been dropped onto the Solar System from above, plunging between the Sun and the orbit of Mercury. It was also moving extremely quickly. The Solar System was formed from a flattened disk of material, and all of the planets orbit roughly in the plane of that disk. Smaller objects, like dwarf planets and comets, may take somewhat more erratic approaches with orbits tilted out of that plane, but they still roughly aligned with it. We had literally never seen anything like ‘Oumuamua. Read 8 remaining paragraphs | Comments

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First-known interstellar visitor is a bizarre, cigar-shaped asteroid

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

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An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

Read more here:
An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

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An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

See the article here:
An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

See the original article here:
An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

Read More:
An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

Read the original:
An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope

Astronomy needs expensive things, and lots of them. You might remember that astronomers almost literally turned the Earth into a telescope just to see a black hole, by combining lots of existing radio telescope dishes. Read more…

Read the original:
An Old Satellite Dish Found on Google Maps Is Becoming West Africa’s First Radio Telescope