9/13/2023 0 Comments Nasa news darkness![]() Galaxies of this type are very rare, and they are considered the remnants of giant galaxies which formed in the early days of the universe. NGC 1277 is considered a prototype “relic galaxy” which means a galaxy which has had no interactions with its neighbours. In the current standard model cosmology massive galaxies contain substantial quantities of dark matter, a type of matter which does not interact in the same way as normal matter the only evidence for its existence is the strong gravitational pull which it exerts on the stars and the gas nearby, and this interacton is observable. “This result does not fit in with the currently accepted cosmological models, which include dark matter” explains Comerón. The study is published in the specialized journal Astronomy and Astrophysics.Ī team of scientists, led by the researcher at the IAC and the University of La Laguna (ULL) Sebastién Comerón, has found that the galaxy NGC 1277 does not contain dark matter.This is the first time that a massive galaxy (it has a mass several times that of the Milky Way) does not show evidence for this invisible component of the universe. The result is a challenge to the current standard model of cosmology. Solar flares and CMEs are the most powerful explosions in our solar system.International research led by the Instituto de Astrofísica de Canarias (IAC) and the University of La Laguna (ULL) has found the first evidence of a massive galaxy with no dark matter. When particularly strong, a CME can also interfere in power utility grids, which at their worst can cause electricity shortages and power outages. When charged particles from a CME reach areas near Earth, they can trigger intense lights in the sky, called auroras. They explode into space at very high speed when the Sun’s magnetic field lines suddenly reorganize. CMEs are huge bubbles of radiation and particles from the Sun. Solar flares are sometimes accompanied by a coronal mass ejection (CME for short). A loop of solar material, a coronal mass ejection (CME), can also be seen rising up off the right limb of the Sun. NASA's Solar Dynamics Observatory captured this imagery of a solar flare, as seen in the bright flash. If a solar flare is very intense, the radiation it releases can interfere with our radio communications here on Earth. Solar flares release a lot of radiation into space. ![]() This can cause a sudden explosion of energy called a solar flare. The magnetic field lines near sunspots often tangle, cross, and reorganize. ![]() Image credit: NASA/SDO/AIA/HMI/Goddard Space Flight Center Solar Flares In this image, you can see an active region on the sun with dark sunspots. These magnetic fields are so strong that they keep some of the heat within the Sun from reaching the surface. Why are sunspots relatively cool? It’s because they form at areas where magnetic fields are particularly strong. The temperature of a sunspot is still very hot though-around 6,500 degrees Fahrenheit! They appear dark because they are cooler than other parts of the Sun’s surface. Sunspots are areas that appear dark on the surface of the Sun. ![]() The glowing hot gas traces out the twists and loops of the Sun’s magnetic field lines. Solar activity can have effects here on Earth, so scientists closely monitor solar activity every day.Īn image of active regions on the Sun from NASA’s Solar Dynamics Observatory. ![]() The amount of solar activity changes with the stages in the solar cycle. Sometimes the Sun’s surface is very active. This motion creates a lot of activity on the Sun's surface, called solar activity. The Sun’s gases are constantly moving, which tangles, stretches and twists the magnetic fields. It has electrically charged gases that generate areas of powerful magnetic forces. The surface of the Sun is a very busy place. ![]()
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