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How Many Galaxies Are in the Universe? A New Answer From the Darkest Sky Ever Observed


How Many Galaxies Are in the Universe? A New Answer From the Darkest Sky Ever Observed
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Ordinarily, we point telescopes at some object we want to see in greater detail. In the 1990s astronomers did the opposite. They pointed the most powerful telescope in history, the Hubble Space Telescope, at a dark patch of sky devoid of known stars, gas, or galaxies. But in that sliver of nothingness, Hubble revealed a breathtaking sight: The void was brimming with galaxies.
Astronomers have long wondered how many galaxies there are in the universe, but until Hubble, the galaxies we could observe were far outnumbered by fainter galaxies hidden by distance and time. The Hubble Deep Field series (scientists made two more such observations) offered a kind of core sample of the universe going back nearly to the Big Bang. This allowed astronomers to finally estimate the galactic population to be ....

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NASA spacecraft discovers the universe is less crowded than we thought


NASA spacecraft discovers the universe is less crowded than we thought
Observations from New Horizons at the edge of the solar system indicate there may be fewer galaxies than we thought.
Listen
- 01:55
This very wide, multiframe panorama was taken in October 2014 at Canyon de Chelly National Monument in northeast Arizona. The zodiacal light is at left, with the northern Milky Way to the right.
Z. Levay
While we might think of space as a vast sea of blackness, all we have to do is look up at night to see that it s punctuated by countless stars, galaxies and even a few planets visible to the naked eye. ....

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There may be fewer galaxies in the universe than we thought


There may be fewer galaxies in the universe than we thought
CNN
1/13/2021
By Ashley Strickland, CNN
© Zolt Levay/Space Telescope Science Institute
This photo shows a phenomenon known as zodiacal light. At lower left, a glowing patch extends to the upper right in the direction of Jupiter, the bright object left of center. Zodiacal light is caused by sunlight reflecting off tiny dust particles in the inner solar system the disintegrated remains of comets and asteroids. Attempts to measure how dark space is using telescopes like Hubble have been thwarted by this ambient glow. As a result, astronomers relied on NASA s distant New Horizons spacecraft to observe the sky free from zodiacal light. The faint background they measured is the equivalent of seeing a neighbor s refrigerator light from a mile away. This very wide, multi-frame panorama was taken in October 2014 at Canyon de Chelly National Monument in northeast Arizona. The zodiacal lig ....

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