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Helio

Joined: Jun 1, 2020

Last seen: Today at 7:06 PM

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- Helio posted the thread Rare Stratospheric clouds in Astronomy.
  
  Spaceweather.com today has a great image of a rare occurrence of ice-crystal clouds in the stratosphere in the arctic. Apparently, the...
  
  Wednesday at 5:13 PM
- Helio replied to the thread Scientists find hints of the dark universe in 3D maps of the cosmos.
  
  If models drop DM and DE then astronomers would need to find another label to use to describe observed effects. The label,: dark...
  
  Wednesday at 4:44 PM
- Helio reacted to Admin's post in the thread Scientists find hints of the dark universe in 3D maps of the cosmos with Like.
  
  Computer algorithms can model the universe, matching simulations to observations and revealing the distribution of dark matter...
  
  Wednesday at 4:30 PM
- Helio replied to the thread Boom Supersonic XB-1 jet breaks sound barrier on historic test flight (video).
  
  Nice story, UE. There are a few sonic boom war stories that may surprise many. Here is one, with animation, using an F16 in the Iraq war.
  
  Jan 28, 2025
- Helio replied to the thread Newly discovered super-Earth orbits in and out of its star's habitable zone. Could life survive its extreme climate?.
  
  Using a density table that varies with exo type, I get a radius of 1.68 earth radii. This equates to 2.1g and an escape velocity of...
  
  Jan 28, 2025
- Helio reacted to Admin's post in the thread Boom Supersonic XB-1 jet breaks sound barrier on historic test flight (video) with Like.
  
  Boom Supersonic made history today (Jan. 28) when its XB-1 jet broke the sound barrier for the first time on a test flight over the...
  
  Jan 28, 2025
- Helio replied to the thread Boom Supersonic XB-1 jet breaks sound barrier on historic test flight (video).
  
  FWIW, its speed of Mach 1.1 is about 730 mph at 35k feet. Odd that a company's name would refer to what it is trying to greatly...
  
  Jan 28, 2025
- Helio reacted to Unclear Engineer's post in the thread Boom Supersonic XB-1 jet breaks sound barrier on historic test flight (video) with Like.
  
  This test aircraft has a long needle nose, plus other necessary shape features (e.g., engine air intake structures) carefully configured...
  
  Jan 28, 2025
- Helio reacted to Unclear Engineer's post in the thread Newly discovered super-Earth orbits in and out of its star's habitable zone. Could life survive its extreme climate? with Like.
  
  A few comments and questions: 1. The article states both "The planet provides a brilliant target for the next generation of...
  
  Jan 28, 2025
- Helio replied to the thread Newly discovered super-Earth orbits in and out of its star's habitable zone. Could life survive its extreme climate?.
  
  Luminosity is sometimes meant as apparent luminosity, IMO. It's an oversight. That's how I took it. Planets are illuminated and...
  
  Jan 28, 2025
- Helio replied to the thread Newly discovered super-Earth orbits in and out of its star's habitable zone. Could life survive its extreme climate?.
  
  Interesting planet and, as noted, close to us. It has several less eccentric sister planets, too. The greater the eccentricity, per...
  
  Jan 28, 2025
- Helio reacted to Admin's post in the thread Newly discovered super-Earth orbits in and out of its star's habitable zone. Could life survive its extreme climate? with Like.
  
  Located less than 20 light years away, HD 20794d could potentially be one of the most Earth-like planets found so far, despite its...
  
  Jan 28, 2025
- Helio replied to the thread What are the prerequisites for cosmology?.
  
  General Relativity involves math even Einstein could not figure out on his own. It's very difficult. The history behind today's modern...
  
  Jan 28, 2025
- Helio reacted to Admin's post in the thread Beam me to the stars: Scientists propose wild new interstellar travel tech with Like.
  
  "Chemical rockets that we use today, even with the extra speed boost from flying by planets, or from swinging by the sun for a boost...
  
  Jan 24, 2025
- Helio reacted to Admin's post in the thread Hubble Space Telescope reveals richest view of Andromeda galaxy to date (image) with Like.
  
  The most detailed panorama of the entire Andromeda galaxy is packed with science that could revolutionize our understanding of how...
  
  Jan 24, 2025
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