student at the University of California, Riverside, NASA’s Alternative Earths and NExSS Virtual Planetary Laboratory teams. Most cells have mechanisms for expelling harmful substances,” said Michaela Leung, a Ph.D. “Methylation is so widespread on Earth, we expect life anywhere else to perform it. Is methyl bromide as an ideal biosignature? So observing them tells astronomers a lot about conditions inside the galaxy.” When PAHs are illuminated with optical and UV radiation from stars, they get excited and are very bright in infrared emission bands. But they’re not only attractive to scientists because of their connection to life.

Those compounds may have played a role in the early formation of life. They’re important building blocks for prebiotic compounds. Meanwhile, we learn that “Webb Sees Organic Molecules in the Hearts of Galaxies, Surprisingly Close to Active Supermassive Black Holes” (Evan Gough, Universe Today, October 13, 2022): “The molecules in this study are polycyclic aromatic hydrocarbons (PAHs). By comparing that combined light with a white dwarf that we know doesn’t have any planets around it, we could detect the exoplanet.” –, OctoThe paper is open access. That means the infrared light coming from a white dwarf would also contain some of the infrared light from the orbiting planet. White dwarfs are relatively cool, so any orbiting planet would be relatively warm (especially compared with the ratio of the sun’s temperature to Earth’s temperature).

Stony Brook astrophysicist Paul Sutter comments that many of them host planets within their habitable zones: “Because the usual methods of looking for exoplanet transits or shifts in motion won’t work for white dwarfs, the astronomers propose a much simpler way to look for planets around white dwarfs: just stare at them. Recently, there’s been some interest in planets orbiting white dwarf stars - old stars that are running out of fuel (but not any time soon). Of course, we are just as likely to find life closer to home anyway. It is only because the cat thinks the light spot is an object, that it thinks it has superluminal speeds.” Sabine Hossenfelder explains in more detail here. The spot of light moves incredibly fast for the cat, but in reality the light dot is not the same photons at point A as at point B. Most superluminal objects are like teasing a cat with a laser pointer. We asked theoretical physicist Rob Sheldon about that and he replied, “No, it isn’t going faster than the speed of light. Incidentally, a group of astronomers recently claimed to have detected matter exceeding the speed of light. With 56,000 galaxies, there wold be, in principle, many places to look for life: “Galaxies, such as the Milky Way, are the building blocks of the universe, each comprised of up to several hundred billion stars.” – Ī big barrier to exploration is, of course, the speed of light most galaxies are many light years away and nothing moves faster than light.

In this view, the obscuring plane of the Milky Way mostly maps to the edges but also cuts across the center of the figure/University of Hawaiʻi Each dot represents a galaxy, and the color of the dot indicates distance from us, with blue tones nearby and redder tones farther away. The universe (as much of we know of it) has now been mapped: Full-sky map showing Cosmicflows-4’s 56,000 galaxies with distance measurements. Share Facebook Twitter Print arroba Email

Alien news nasa