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Category: space – Page 188

The universe is expanding. How fast it does so is described by the so-called Hubble-Lemaitre constant. But there is a dispute about how big this constant actually is: Different measurement methods provide contradictory values.

This so-called “Hubble tension” poses a puzzle for cosmologists. Researchers from the Universities of Bonn and St. Andrews are now proposing a new solution: Using an alternative theory of gravity, the discrepancy in the measured values can be easily explained—the Hubble tension disappears. The study has now been published in the Monthly Notices of the Royal Astronomical Society (MNRAS).

The causes the galaxies to move away from each other. The speed at which they do this is proportional to the distance between them. For instance, if galaxy A is twice as far away from Earth as galaxy B, its distance from us also grows twice as fast. The US astronomer Edwin Hubble was one of the first to recognize this connection.

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Micrometeorites originating from icy celestial bodies in the outer solar system may be responsible for transporting nitrogen to the near-Earth region in the early days of our solar system. That discovery was published in Nature Astronomy by an international team of researchers, including University of Hawai’i at Mānoa scientists, led by Kyoto University.

Nitrogen compounds, such as ammonium salts, are abundant in material born in regions far from the sun, but evidence of their transport to Earth’s orbital region had been poorly understood.

“Our recent findings suggest the possibility that a greater amount of than previously recognized was transported near Earth, potentially serving as for life on our planet,” says Hope Ishii, study co-author and affiliate faculty at the Hawai’i Institute of Geophysics and Planetology in the UH Mānoa School of Ocean and Earth Science and Technology (SOEST).

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If humans intend to conquer the stars and spread civilization beyond Earth, we really need to figure out sex: can humans conceive and have babies in places such as Mars, where factors like high amounts of radiation and lower gravity could wreck the adult body, nevermind potentially hindering natural conception and deforming growing fetuses?

A growing number of researchers and entrepreneurs want to tackle those questions. Take this startup called Spaceborn United, which we’ve blogged about previously.

The company is still hard at work, according to new reporting from AFP, with the aim of having a baby naturally conceived and born on Mars in the future.

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