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NASA found that the universe is not as crowded as we thought



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This very wide panorama was taken in October 2014 at Canyon Decelli National Monument in northeastern Arizona. The zodiac light is on the left, and the northern Milky Way is on the right.

Z. Levi

Although we may think of space as a dark sea, all we have to do is look up at night to find that it is dotted with countless stars, galaxies and even a few stars. Planet visible to the naked eye.

Scientists recently used data from NASA’s “New Horizons” mission, rather than Pluto, to measure how dark the background of the universe is. What they found hinted at what we thought we knew about the composition of the entire universe.

In short, space is so dark that there are not so many galaxies adding faint glow to the background as astronomers previously estimated.

“Know this is an important number-how many galaxies are there?” Mark Postman of the Space Telescope Science Institute said in a statement on Tuesday. “We can’t see the light from 2 trillion galaxies at all.”

That was an earlier estimate from observations by the Hubble Space Telescope, but a new study to be published in the Astrophysical Journal and co-authored by the postman indicates that the total number of galaxies in the universe may be in the hundreds of billions instead of Trillions.

Interestingly, this is closer to an earlier number, which is about 200 billion galaxies. This is based on Hubble data in the 1990s.

New Horizons is located near the edge of the solar system, making the surrounding sky 10 times darker than where Hubble is.

The co-author of the study, Tod Lauer of the National Optical Infrared Astronomy Research Laboratory, said: “This type of measurement is very difficult. Many people have tried it for a long time.” “New Horizons provides us with an advantage that can be better than anyone. Can better measure the optical background of the universe.”

The results of the research team will be announced at the American Astronomical Society meeting on Wednesday.

coming soon James Webb Space TelescopeThe galaxy is currently preparing to launch on the eve of Halloween. It will help to further understand how many kinds of galaxies and which ones can emit faint background light, so that the universe will no longer be completely black.

follow CNET’s 2021 space calendar Keep up with all the latest space news this year. You can even add it to your Google Calendar.


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