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16 paź 2023 · An astronomer explains why space looks so dark despite containing 200 billion trillion stars.
20 gru 2011 · The dark belts we see in the best galactic candidates often cross their entire spans; variations in width, darkness, as well as other interesting features may be detected along the dust belts’ lengths, including clumps of luminosity appearing as mottling and glowing formations.
19 paź 2023 · The study of distant stars and planets helps astronomers like me understand why space is so dark. You might guess it’s because a lot of the stars in the universe are very far away from Earth.
Galactic dark belts represent, of course, a greater whole, and pervade deep into the entire discs of these galaxies. We only see them as belts because we are looking into those galactic planes from the side; the individual diffuse nebulae we see in our own galaxy are merely parts of a similar whole.
Clearly, there’s something wrong with the simple calculation, and a big clue about what it is came in the 1920s when astronomers discovered that the Universe is expanding after exploding from a Big Bang billions of years ago.
28 cze 2023 · Space is black because not all of the light from the stars reaches us, due to the expanding universe and the fact that it is finite. Have you ever pondered why space is black? This profound question lies at the heart of a centuries-old enigma known as Olber’s Paradox.
11 kwi 2022 · The abundant X-rays, the gravitationally lensed images (thin curving arcs) of background galaxies, and the measured velocities of galaxies in the clusters all show that the total mass of Abell 1689—most of it dark matter—is about 1015 solar masses.
