11:31 Could space be infinite at the Big Bang? Several more modern methods have been used to map our Galaxy more accurately. The picture shows half the sky, so stars which are as far out as the Sun By measuring the motions of a large number of stars of a given class, we can estimate their average distance from their average motion. This occurred at a distance of about 950,000 light-years from the Milky Way’s center, marking the galaxy’s edge, the scientists say. “The edge of the stars is very sharp, almost like the stars just stop at a particular radius.”. ITunes: https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2 It is published by Society for Science & the Public, a nonprofit 501(c)(3) membership organization dedicated to public engagement in scientific research and education. How far away is the nearest star to our sun? 30:11 Will the magnetic reversal be devastating? satellite. 10 billion years old, and our Sun is approx. And More…, Episode 688: Remnants From the Early Universe. They predict that in approximately 200 million years there will be an episode of starburst in the Galactic Center, with many stars forming rapidly and undergoing supernovae at a hundred times the current rate. Interestingly, the size of our own Galaxy was debated for a long while.  In the equatorial coordinate system the location is: RA 17h 45m 40.04s, Dec −29° 00′ 28.1″ (J2000 epoch). It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way.  They seem to have all been formed in a single star formation event a few million years ago. In particular, the scientists sought cases where two giant galaxies arose side by side, like the Milky Way and Andromeda, our nearest giant neighbor, because each galaxy’s gravity tugs on the other (SN: 5/12/15). There are massive star clusters, such as the Arches,Quintuplet, and the GC star cluster. The physics of their pulsations is such that the period of one oscillation is related to the luminosity of the star.  It is 8.2 ± 0.4 kiloparsecs (26,700 ± 1,300 ly) away from Earth in the direction of the constellations Sagittarius, Ophiuchus, and Scorpius where the Milky Way appears brightest. This image makes the Milky Way appear much more galaxy-like and less like the smudge of stars we see stretching across our night sky. If it could travel at the speed of light, an impossibility due to Special Relativity, it would still take over 26,000 years to arrive! arXiv:2002.09497.
This starburst may also be accompanied by the formation of galactic relativistic jets as matter falls into the central black hole.
The number could lead to a better estimate of how massive the galaxy is and how many other galaxies orbit it.
And we end with a calculation of the entire Milky Way’s mass.
42:38 Would there be a Universe without us to observe it? We start with Shapley’s globular cluster map that first showed that we were not at the center of the galaxy. The stars in these clusters are also very bright in the X-ray part of the spectrum, as winds blowing off their surfaces collide with gas emitted from other stars in the region. It is 8.2 ± 0.4 kiloparsecs (26,700 ± 1,300 ly) away from Earth in the direction of the constellations Sagittarius, Ophiuchus, and Scorpius where the Milky Way appears brightest. Even with these (and other) complications, Cepheid Variables provide an excellent way to measure the relative distances. Statistically, stars move at about the same rate; therefore, the stars that appear to have larger motions are nearer. 11 to 14 billion years, the Milky Way galaxy is approx. To find the Milky Way’s edge, Deason’s team conducted computer simulations of how giant galaxies like the Milky Way form. Since a black hole has such a huge gravitational footprint, it tries to suck up anything that comes within its reach.  This observation however does not allow definite conclusions to be drawn at this point. The Milky Way’s center is 26,000 light-years from Earth, and Sgr A* is measured to be about 14 million miles across. Astronomers could also search for individual stars out at the boundary, says Mike Boylan-Kolchin, an astrophysicist at the University of Texas at Austin who was not involved with the study. A small portion of a gigapixel color mosaic of the Milky Way's heart. In the future, astronomers can refine the location of the Milky Way’s edge by discovering additional small galaxies nearby.  It is thought that the Milky Way undergoes a starburst of this sort every 500 million years. through the obscuring dust clouds in Sagittarius and elsewhere show that Shapley was able use these to find the distance to the globular clusters that surround our Galaxy. The Sun is located about two-thirds of the way out from the center in … Headlines and summaries of the latest Science News articles, delivered to your inbox. The Sun is approximately in the center (slightly to the left) and the Here’s a longer article about the image below.
Astronomers use more indirect methods beyond a few thousand light years. We detail the evidence for the existence of a supermassive black hole, Sagittarius A*, at the very center of the galaxy’s core. FAQ | Not only does Sgr A* try to eat anything that goes near it, the area around it is a good place for new stars to form. Post was not sent - check your e-mail addresses!
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