Tech UPTechnologyThey create the most detailed 3D map of the...

They create the most detailed 3D map of the universe and it is spectacular

Thanks to the Dark Energy Spectroscopic Instrument (DESI), scientists now have the most detailed 3D map of the universe to date. DESI has cataloged in about 7 months around 8 million galaxies, double the number that had been previously mapped.


The survey will last five years.

This three-dimensional map is expected to help us solve the mystery of why the universe is expanding faster and faster. At the moment, it has mapped these almost 8 million galaxies but when it is complete, it will have a catalog of 35 million galaxies . This is expected to happen in 2026.


How does it work?

The instrument, mounted on a telescope in Arizona, works by measuring how much light emitted by distant galaxies is shifted toward longer wavelengths ; it’s what’s known as the red shift, and it tells us how much the universe has expanded in the time it took that light to reach Earth.

Having this map will allow astronomers to understand how the universe began and where it is headed : will it continue to expand? will it collapse?

One of the questions the team hopes to resolve with the survey is the dilemma over the fact that the expansion of the universe seems to be accelerating, rather than stopping and contracting, as the Big Bang theory suggests.

“In five years, we hope to find a departure from this model of cosmology that will give us a clue as to what is really going on. Because today we’re kind of stuck with a simple model that describes the data [we have] perfectly well, but doesn’t give us any new information ,” explains Julien Guy of the Lawrence Berkeley National Laboratory in California.


Reference: Berkeley Lab

China is building an artificial moon

The artificial moon has a low-gravity environment to help us dig deeper into our satellite.

They detect a possible second supermoon outside the solar system

This moon, which would orbit a planet the size of Jupiter, is almost three times larger than Earth. More observations are needed to confirm the finding.

The cosmic bubble that surrounds the Sun is the source of all nearby stars

A team of astrophysicists has demonstrated this by means of a 3D model of the origin of the Local Bubble, some 500 light-years in diameter.

A large asteroid will approach Earth next week

More than twice the size of the Empire State Building, asteroid 7482 (1994 PC1) will pass five times the distance to the Moon.

The oldest 'Homo sapiens' lived 35,000 years earlier than previously thought

The dating of a massive volcanic eruption in Africa shows that modern humans were already there 230,000 years ago.