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#terrestrial_planet
phonemantra-blog · 6 months
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New research shows how comets could be the source of life on planets outside our solar system Scientists theorize that comets may have spread the organic ingredients necessary for the emergence of life on Earth. New research suggests that comets may also deliver these elements to exoplanets. During the formation of the solar system, the Earth was bombarded by asteroids, comets and other space objects. How the planet obtained the water and molecules necessary for life is still controversial, but comets are considered the most likely sources of these substances. [caption id="attachment_83089" align="aligncenter" width="650"] planet[/caption] But if comets could potentially bring the seeds of life to Earth, could they serve a similar function for exoplanets in other parts of the universe? To explore this question, a team of researchers from the Institute of Astronomy at the University of Cambridge developed mathematical models that helped reveal how comets could transfer similar vital elements to other planets in our galaxy. While the study's findings do not yet provide a definitive answer about the presence of life on other planets, they may help narrow the search for exoplanets that may support life. “wandering” from planet to planet, spread life throughout the Universe? “We continue to learn more about the atmospheres of exoplanets, so our goal was to find out whether there were planets where complex organic molecules could also be delivered by comets. It's possible that the molecules that enabled life on Earth were brought in by comets, and the same may be true for planets in other galaxies,” said Richard Enslow, one of the study's authors, who works at the Institute of Astronomy at the University of Cambridge. Over the past decades, scientists have learned more about the prebiotic molecules found in comets. For example, NASA's Stardust mission discovered samples of glycine, an amino acid and building block of proteins, in Comet Wild 2 (81P/Wild), and the European Space Agency's Rosetta mission discovered organic molecules in the coma of Comet Churyumov-Gerasimenko (67P). However, these organic molecules can be destroyed by strong comet impacts on the planet. So Enslow and his colleagues had to find scenarios in which a comet-planet collision occurs slowly enough to preserve the ingredients of life intact. The study, based on simulations, found that the slowest impact velocities occur in solar systems where planets are densely packed. Comets moving through such systems are slowed down by the gravitational influence of the planets. The simulations also showed that conditions for the emergence of life may be suitable on rocky planets orbiting red dwarfs. They are the most common type of star in the galaxy and are of interest to astronomers searching for exoplanets. However, planets in such systems are subject to more frequent high-speed collisions with comets and the likelihood of life appearing there is low, especially if the planets are located at significant distances from each other. “We can identify the types of systems that could be the subject of research to test different models for the origin of life. And this is another way to look at the amazing diversity of life on Earth and look for its analogues on other planets,” Anslow commented.
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sanjaylodh · 4 months
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Mercury Venus Earth Mars is only rocky
Mercury Venus Earth Mars is only rocky
Is there no evidence of the remaining five planets being terrestrial?
Terrestrial planet
Wikipedia
https://en.wikipedia.org › wiki › Terrestrial_planet
A terrestrial planet, telluric planet, or rocky planet, is a planet that is composed primarily of silicate rocks or metals. Within the Solar System,
A terrestrial planet, telluric planet, or rocky planet, is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets accepted by the IAU are the inner planets closest to the Sun: Mercury, Venus, Earth and Mars. Among astronomers who use the geophysical definition of a planet, two or three planetary-mass satellites – Earth's Moon, Io, and sometimes Europa – may also be considered terrestrial planets. The large rocky asteroids Pallas and Vesta are sometimes included as well, albeit rarely.[1][2][3] The terms "terrestrial planet" and "telluric planet" are derived from Latin words for Earth (Terra and Tellus), as these planets are, in terms of structure, Earth-like. Terrestrial planets are generally studied by geologists, astronomers, and geophysicists.
Terrestrial | Planet Types – Exoplanet Exploration - NASA
NASA (.gov)
https://exoplanets.nasa.gov › what-is-an-exoplanet › t...
13 Apr 2022
Terrestrial planets have a solid planetary surface, making them substantially different from larger gaseous planets, which are composed mostly of some combination of hydrogen, helium, and water existing in various physical states.
What is a terrestrial planet?
In our solar system, Earth, Mars, Mercury and Venus are terrestrial, or rocky, planets. For planets outside our solar system, those between half of Earth’s size to twice its radius are considered terrestrial and others may be even smaller. Exoplanets twice the size of Earth and larger may be rocky as well, but those are considered super-Earths.
Line-up of terrestrial planets
Artist’s concept of how rocky, potentially habitable worlds elsewhere in our galaxy might appear. Data gathered by telescopes in space and on the ground suggest that small, rocky planets are common. (Placing them so close together in a line is for illustrative purposes only.) Credit: NASA/JPL-Caltech/R. Hurt
Latest news
 Discovery Alert: Earth-sized Planet Has a 'Lava Hemisphere'
Terrestrial planets (Earth sized and smaller) are rocky worlds, composed of rock, silicate, water and/or carbon. To determine if some of these worlds have atmospheres, oceans or other signs of habitability, it takes more investigation. Larger terrestrial exoplanets (those at least twice as massive as Earth) are classified as super-Earths.
How many planets are found by scientists?
But do we know how many planets are out there? Astronomers have discovered 5,502 planets around other stars (known as exoplanets) in the Milky Way. Add in the eight in our solar system (not nine, sorry Pluto), and that gives us a total of 5,510 known planets, all located in our own galaxy.8 Sept 2023
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बुध शुक्र पृथ्वी मंगल ही चट्टानी है
क्या बाकी पांच ग्रह में टेरेस्ट्रियल होने का कोई गवाह नहीं है
स्थलीय ग्रह
विकिपीडिया
https://en.wikipedia.org ›विकी› टेरेस्ट्रियल_प्लेनेट
स्थलीय ग्रह, टेल्यूरिक ग्रह, या चट्टानी ग्रह, एक ऐसा ग्रह है जो मुख्य रूप से सिलिकेट चट्टानों या धातुओं से बना होता है। सौर मंडल के भीतर,
स्थलीय ग्रह, टेल्यूरिक ग्रह, या चट्टानी ग्रह, एक ऐसा ग्रह है जो मुख्य रूप से सिलिकेट चट्टानों या धातुओं से बना होता है। सौर मंडल के भीतर, IAU द्वारा स्वीकृत स्थलीय ग्रह सूर्य के निकटतम आंतरिक ग्रह हैं: बुध, शुक्र, पृथ्वी और मंगल। खगोलविदों के बीच जो किसी ग्रह की भूभौतिकीय परिभाषा का उपयोग करते हैं, दो या तीन ग्रह-द्रव्यमान उपग्रह - पृथ्वी का चंद्रमा, आयो और कभी-कभी यूरोपा - को भी स्थलीय ग्रह माना जा सकता है। बड़े चट्टानी क्षुद्रग्रह पल्लास और वेस्टा को भी कभी-कभी शामिल किया जाता है, यद्यपि शायद ही कभी।[1][2][3] शब्द "स्थलीय ग्रह" और "टेल्यूरिक ग्रह" पृथ्वी (टेरा और टेलस) के लिए लैटिन शब्दों से लिए गए हैं, क्योंकि ये ग्रह संरचना की दृष्टि से पृथ्वी जैसे हैं। स्थलीय ग्रहों का अध्ययन आमतौर पर भूवैज्ञानिकों, खगोलविदों और भूभौतिकीविदों द्वारा किया जाता है।
स्थलीय | ग्रह के प्रकार - एक्सोप्लैनेट अन्वेषण - नासा
नासा (.gov)
https://exoplanets.nasa.gov ›what-is-an-exoplanet ›t...
13 अप्रैल 2022
स्थलीय ग्रहों की एक ठोस ग्रह सतह होती है, जो उन्हें बड़े गैसीय ग्रहों से काफी अलग बनाती है, जो ज्यादातर विभिन्न भौतिक अवस्थाओं में मौजूद हाइड्रोजन, हीलियम और ��ानी के कुछ संयोजन से बने होते हैं।
स्थलीय ग्रह क्या है?
हमारे सौर मंडल में, पृथ्वी, मंगल, बुध और शुक्र स्थलीय, या चट्टानी ग्रह हैं। हमारे सौर मंडल के बाहर के ग्रहों के लिए, पृथ्वी के आधे आकार से लेकर उसकी त्रिज्या के दोगुने के बीच के ग्रहों को स्थलीय माना जाता है और अन्य इससे भी छोटे हो सकते हैं। पृथ्वी से दोगुने आकार और बड़े एक्सोप्लैनेट चट्टानी भी हो सकते हैं, लेकिन उन्हें सुपर-अर्थ माना जाता है।
स्थलीय ग्रहों की पंक्ति
कलाकार की अवधारणा कि हमारी आकाशगंगा में कहीं और चट्टानी, संभावित रूप से रहने योग्य दुनिया कैसे दिखाई दे सकती है। अंतरिक्ष और जमीन पर दूरबीनों द्वारा एकत्र किए गए डेटा से पता चलता है कि छोटे, चट्टानी ग्रह आम हैं। (उन्हें एक पंक्ति में एक साथ इतना करीब रखना केवल उदाहरण के लिए है।) क्रेडिट: NASA/JPL-कैलटेक/आर। आहत
ताजा खबर
  डिस्कवरी अलर्ट: पृथ्वी के आकार के ग्रह में 'लावा गोलार्ध' है
स्थलीय ग्रह (पृथ्वी के आकार के और छोटे) चट्टानी दुनिया हैं, जो चट्टान, सिलिकेट, पानी और/या कार्बन से बने हैं। यह निर्धारित करने के लिए कि क्या इनमें से कुछ दुनिया में वायुमंडल, महासागर या रहने योग्य अन्य लक्षण हैं, अधिक जांच की आवश्यकता है। बड़े स्थलीय एक्सोप्लैनेट (जो पृथ्वी से कम से कम दोगुने बड़े हैं) को सुपर-अर्थ के रूप में वर्गीकृत किया गया है।
वैज्ञानिकों ने कितने ग्रह खोजे हैं?
लेकिन क्या हम जानते हैं कि वहां कितने ग्रह हैं? खगोलविदों ने आकाशगंगा में अन्य तारों (जिन्हें एक्सोप्लैनेट के रूप में जाना जाता है) के आसपास 5,502 ग्रहों की खोज की है। हमारे सौर मंडल में आठ (नौ नहीं, क्षमा करें प्लूटो) को जोड़ें, और इससे हमें कुल 5,510 ज्ञात ग्रह मिलते हैं, जो सभी हमारी अपनी आकाशगंगा में स्थित हैं। 8 सितंबर 2023
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wigmund · 6 years
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From NASA Image of the Day; April 13, 2018:
NASA's TESS Mission Hopes to Find Exoplanets Beyond Our Solar System
The worlds orbiting other stars are called “exoplanets,” and they come in a wide variety of sizes, from gas giants larger than Jupiter to small, rocky planets about as big around as Earth or Mars. This artist’s impression shows an exoplanet orbiting the Sun-like star HD 85512 in the southern constellation of Vela (The Sail).
This rocky super-Earth is an illustration of the type of planets future telescopes, like NASA's Transiting Exoplanet Survey Satellite (TESS) and James Webb, hope to find outside our solar system. TESS, slated to launch on April 16, 2018, is the next step in the search for planets outside of our solar system, including those that could support life. The mission will find exoplanets that periodically block part of the light from their host stars, events called transits. TESS will survey 200,000 of the brightest stars near the sun to search for transiting exoplanets.
Image Credit: ESO/M. Kornmesser
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