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alfa015

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About alfa015

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  • Favorite Area of Science
    Astronomy

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  1. Guys, I made a short video that some of you might find helpful, especially these times At least it was helpful for me while I was making it. Just some cinema shots with some music; I just put them together. Here it is: video link removed
  2. Book ''Is there life out there?'', by Sara Seager: https://www.saraseager.com/wp-content/uploads/2016/08/book-is-there-life-out-there.pdf SPAM DELETED Search for exoplanets online: https://www.zooniverse.org/projects/nora-dot-eisner/planet-hunters-tess/classify AND https://www.zooniverse.org/projects/ianc2/exoplanet-explorers/classify NASA app Eyes on Exoplanets: https://exoplanets.nasa.gov/eyes-on-exoplanets/#/
  3. Hi, I would like to share with you guys a couple of interesting simulations. This simulation belongs to an Earth-like planet located 4 light-years away, imaged with the European Extremely Large Telescope (ELT), expected in 2025: This other simulation belongs to an Earth-like planet located 40 light-years away, imaged with the Large Ultraviolet Optical Infrared Surveyor (LUVOIR), expected in 2035: SPAM DELETED What is the first exoplanet you would like to see an image of?
  4. Here some mind-blowing possibilities about super habitable exoplanets: 1. The colour of the sky could be light blue, similar to the colour of the sky on Earth in summer. 2. The oceans could be shallow, with a turquoise blue colour. 3. The vegetation could cover more regions than in Earth, and the colour of the trees could be purple. Do you agree with these hypotheses?
  5. I would like to talk about an instrument that has been sometimes overlooked: ESPRESSO. As most of you probably know, ESPRESSO is the only current spectrograph able to detect Earth-sized planets. I think it will be a key instrument for 2 reasons: 1- The majority of the most potentially habitable exoplanets were discovered with the radial velocity method. 2- Only 0.5 % of the Earth-like planets in the Milky Way could be detectable by using transit photometry. Do you think we will find a nearby Earth 2.0 with ESPRESSO in 2020?
  6. I think that Alpha centauri could host the closest Earth-like planet. A study shows that 22% of G and K-type stars could have Earth-like planets orbiting in the habitable zone. There are 9 Sun-like stars within 25 light-years. If we make the calculation, two of those stars could have an Earth-like planet. One of those two exoplanets could be Tau Ceti e. Which exoplanet could be the other one? 7 out of the 9 closest Sun-like stars have low metallicity. The only two stars with high metallicity are Alpha Centauri A and Delta Pavonis, but this star is suspected to be variable. What do you guys think?
  7. Hi, Forbes just published an article about the Habitable Exoplanet Hunting Project: http://www.forbes.com/sites/jamiecartereurope/2019/11/25/inside-the-247-search-for-another-habitable-planet-within-100-light-years-of-earth/#149fbf103442 I hope you find it interesting! We welcome any type of observatory to join us. Cheers!
  8. As some of you probably know, the Square Kilometre Array will become the biggest radio telescope on Earth, with a collecting area of 1 square kilometre. The construction will start in 2021 and the first light is expected to take place in 2027. It will cover the frequencies from 50 MHz to 15 Ghz. But what I wanted to share with you guys is a new study about how far the SKA can 'listen'. A recent study points out that the SKA could detect extraterrestrial airport radars 200 light years away. SPAM DELETED What do you guys think?
  9. In October 2012, astronomers announced the discovery of an exoplanet orbiting the star Alpha Centauri B. However, three years later, they concluded that it probably doesn’t exist. In 2013, astronomers also detected another possible exoplanet, but it hasn’t been confirmed yet. As of today, no exoplanets have been discovered around Alpha Centauri A or B. There are several ongoing projects to search for habitable exoplanets in Alpha Centauri: The Expresso spectrograph, which started operating in October 2018, is able to detect radial velocities of less than 10 cm/s. Another promising instrument is called NEAR, which stands for Near Earths in the AlphaCen Region. NEAR is a thermal infrared coronagraph that blocks most of the light coming from Alpha Centauri in order to resolve possible exoplanets around the star. This coronagraph can detect exoplanets 2 times the radius of the Earth. Project Blue is another interesting project that might help us discover the closest Earth-like planet. It is a small space telescope with a coronagraph that will directly image the habitable zones of the Alpha Centauri system. The telescope will be able to detect exoplanets between 0.5 and 1.5 times the radius of the Earth. The launch of the telescope is expected to take place in 2023. NASA is also working on a space telescope with coronagraph called ACEND, which stands for Alpha Centauri Direct Imager. Breakthrough Initiatives is now working on a space telescope called TOLIBOY that will use astrometry to map the motion of the Alpha Centauri stars and search for a perturbation in the positions. The telescope is expected to be launched in 2021. SPAM DELETED Do you think all the agencies and companies should join efforts and build just 1 big space coronagraph, or, as they seem to be doing now, work on different ones?
  10. The massive planet, which shouldn't exist based on current theories, is prompting astronomers to revisit their models for planetary formation. Source: https://astronomy.com/news/2019/09/giant-planet-found-around-tiny-star-defies-expectations
  11. As of September 2019, these are the 5 potentially habitable exoplanets closer to Earth: SPAM DELETED 1.GLIESE 273 b Gliese 283 b orbits the red dwarf star Luyten, located 12 light years away. - The exoplanet is 84% similar to Earth. - It has an orbital period of 18.6 days. - A minimum mass 2 times higher than Earth. - An average radius 40% higher. - And an equilibrium temperature of 11 degrees more. 2. TEEGARDEN b Teegarden b orbits the red dwarf star Teegarden, 12 light years away. - The exoplanet is 95% similar to Earth. - It has an orbital period of 5 days. - A minimum mass and average radius only 5% higher than Earth. - And an equilibrium temperature of 9 degrees more. 3. GLIESE 1061 c Gliese 1061 c orbits the red dwarf star Gliese 1061, 12 light years away. - The exoplanet is 88% similar to Earth. - It has an orbital period of 6.7 days. - A minimum mass 75% higher than Earth. - And an equilibrium temperature of 20 degrees more. 4. TAU CETI e Tau Ceti e orbits the solar-type star Tau Ceti, 12 light years away. - The exoplanet is 74% similar to Earth. - It has an orbital period of 163 days. - A minimum mass 3 times higher than Earth. - An average radius 60% higher. - And an equilibrium temperature of 30 degrees more. 5. PROXIMA B Finally, Proxima b orbits the red dwarf star Proxima Centauri, 4.2 light years away. - The exoplanet is 87% similar to Earth. - It has an orbital period of 11 days. - A minimum mass 30% higher than Earth. - An average radius 10% higher. - And an equilibrium temperature of 28 degrees less. To which of these exoplanets would you go to? why?
  12. Anybody interested? Btw I was recently interviewed by Tony Darnell from Deep Astronomy: SPAM DELETED
  13. Hi all! We are looking for more observatories and amateur astronomers who might want to join the project. The Habitable Exoplanet Hunting Project is a worldwide network of amateur astronomers searching for new potentially habitable exoplanets. I am coordinating over 20 observatories located in 5 continents. We are searching for habitable exoplanets around non-flare G, K and M-type stars located within 100 ly. The stars we are monitoring already have known transiting exoplanets, but none of them are potentially habitable. We are monitoring each star 24/7 for several months. By doing so, we believe that the chances of finding an exoplanet increase for particular targets. Moreover, we are focusing on stars closer than 100 light years because, on the one hand, the closest habitable exoplanets will be the first destinations of interstellar missions and, on the other, because very few nearby habitable exoplanets around G and K-type stars have been discovered: only 2 of them. The number of potentially habitable exoplanets that we could discover is, in theory, around 25. This calculation was obtained by taking into account the number of non-flare stars within 100 light years and the percentage of them that should show transits in the habitable zone. Each observatory observes the same star and, when the transit of a hypothetical habitable exoplanet becomes unlikely, we move to another star. Within 100 light years, we only found 10 non-flare G, K and M-type stars with known transiting exoplanets not potentially habitable. Big telescopes are not necessary, but CCD cameras with a resolution of at least 16 bits are advisable because we are searching for exoplanets that produce a change of brightness in the star of around 0.1%. If you are interested, feel free to contact me. SPAM DELETED
  14. Hi! I would like to share with you guys some facts you might not know about antimatter: 1º - Recent studies suggest that an antimatter spacecraft could achieve up to 70% the speed of light, reaching Proxima b in just about 6 years. 2º - The maximum time that antimatter has been stored is 405 days. 3º - According to the former Fermilab physicist Gerald Jackson, antimatter rockets could become a reality by 2050. SPAM DELETED What are your thoughts about antimatter propulsion?
  15. Aww, alright, then, may I share the instructions on how to use the project by showing this from instructables?: url deleted
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