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Small worlds around other stars may come in more than two varieties. Using exoplanet densities, astronomers have largely sorted planets that are bigger than Earth but smaller than Neptune into two categories: denser, rocky super-Earths, and larger, puffy mini-Neptunes (SN: 6/19/17). Mini-Neptunes are generally thought to be padded in thick layers of hydrogen and helium gas, like the giant planets in our own solar system. But astronomers have detected clear evidence of hydrogen on only some mini-Neptunes — and, curiously, seen traces of water on others (SN: 5/11/17). Now, new simulations indicate that some planets that look like gaseous mini-Neptunes could actually be rocky planets covered in superheated oceans, where the water is in an exotic state between liquid and gas. Such extreme saunalike worlds could bridge the divide between rocky and gaseous planet types, researchers report in the June 15 Astrophysical Journal Letters. Olivier Mousis, a planetary scientist at Aix-Marseille University in France, and colleagues ran simulations of ocean-covered worlds in close orbits around their stars, where mini-Neptunes are often found. Intense stellar radiation would cause water on the planets to puff up into a diffuse layer of “supercritical” water between liquid and gas, topped by a steamy water vapor atmosphere, the team found. On Earth, supercritical water can be used to break down toxic waste. The puffiness of each simulated planet depended on factors like its water content. But Mousis’ team simulated water worlds with a range of sizes and densities that match nearly all of the hundreds of mini-Neptunes discovered so far. This hints that water-containing mini-Neptunes may be better explained by supercritical oceans than by hydrogen and helium gas layers. For instance, the authors note that the mini-Neptune K2 18b, where water has been spotted, fits the profile of a supercritical ocean planet of about 37 percent water (SN: 9/11/19). More detailed observations of exoplanets in the future may prove whether this new planetary model holds water. देशभरिका विभिन्न ठाउँका प्रयोगशालामा गरिएको परीक्षणमा शुक्रबार २७८ मा कोरोना संक्रमण पुष्टि भएको छ । स्वास्थ्थ तथा जनसंख्या मन्त्रालको नियमित पत्रकार सम्मेलनमा प्रवक्ता डा विकास देवकोटाले सो जानकारी दिएका हुन् । संक्रमतिमा २६७ जना पुरुष […] The skull is made out of two arrangements of bones cranial and facial. Cranial bones are 8 in number, facial bones are 14. Thus, the skull is made of all-out 22 bones. The cranial bones […] PathshalaNepal.com is a Registered Company of E. Pathshala Pvt Ltd Nepal. Registration number : 289280 All right Reversed. Pathshala Pvt Ltd We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.
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लोकसेवा आयोगले चैत्र महिनामा लिने परीक्षा स्थगित गरेको छ।बिहीबार बसेको आयोगको बैठकले चैत ८ गतेपछि संचालन हुने सबै लिखित परीक्षा स्थगित गरेको हो। चैत ८ गतेदेखि चैत मसान्तसम्मको लिखित परीक्षा स्थगित गरेको उपसचिव शर्माले जानकारी दिएका छन् । विज्ञप्ति जारी गर्दै लोक सेवा आयोगले सञ्चालन गर्ने निजामती सेवा, सुरक्षा निकाय र संगठित संस्था तर्फका लिखित परीक्षाका कार्यक्रम अर्को सूचना नभएसम्मका लागि स्थगित गरेको जनाएको छ। त्रिभुवन विश्वविद्यालयले पनि चैत महिनाभित्रमा सञ्चालन गरिने सम्पूर्ण परीक्षा स्थगित गरेको छ । क्याम्पमा कार्यरत प्राध्यापकलाई पनि चैत मसान्तसम्म विदा दिने निर्णय गरेको छ । यो विदा आगामी बर्षे तथा हिउँदे विदामा मिलान गरिने उनले जानकारी दिए । विश्वविद्यालय बन्द भएपछि करिब ५ लाख विद्यार्थी र ७ हजार प्राध्यापक घरमै बस्नेछन्। पाल्पाको लुम्बिनी मेडिकल कलेजले ज्वरो आएका बिरामीलाई एम्बुलेन्समै सोधपुछ गरी फर्काइदिएको छ । बगनासकाली गाउँपालिका २ पोखराथोकका २० वर्षीय दामोदर कुमाललाई कलेजले घरमै आइसोलेसनमा बस्न सुझाउँदै फर्कादिएको हो । ‘मलाई ज्वरो आएको छ, खोकी लागेको छ, […] The skull is made out of two arrangements of bones cranial and facial. Cranial bones are 8 in number, facial bones are 14. Thus, the skull is made of all-out 22 bones. The cranial bones […] PathshalaNepal.com is a Registered Company of E. Pathshala Pvt Ltd Nepal. Registration number : 289280 All right Reversed.E. Pathshala Pvt Ltd We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker.