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Four \\u2018Mysterious Signals From Outer Space\\u2019 Are Coming From Galaxies Like Ours, Say Scientists
Link: https://www.forbes.com/sites/jamiecartereurope/2020/06/03/four-mysterious-signals-from-outer-space-are-coming-from-galaxies-like-ours-say-scientists/#1c8e5ff37d76

Compress all that energy into a single burst lasting a mere millisecond and you\\u2019ll understand why fast radio bursts (FRBs) are one of the hottest topics in astronomy.

First discovered in 2007 at Australia\\u2019s Parkes radio telescope, FRBs are very brief, very bright single radio pulses that can last for several milliseconds. It\\u2019s estimated that several thousand per day are occurring over the entire sky.

The most famous one is FRB 121102, unusual because it\\u2019s been detected a few hundred times since it first \\u201cburst\\u201d onto the scene in 2014. FRB 121102 is coming from a small dwarf galaxy about three billion light-years from Earth.

Well, it\\u2019s not black holes, according to Dr. Shivani Bhandari, an astronomer with CSIRO, Australia\\u2019s national science agency, whose new research published this week in The Astrophysical Journal Letters reveals that four FRBs are coming not from the heart of galaxies, but from their edge.

\\u201cThese precisely localised fast radio bursts came from the outskirts of their home galaxies, removing the possibility that they have anything to do with supermassive black holes,\\u201d said Dr. Bhandari. Her team found the exact location of four new fast radio bursts\\u2014FRB 180924, FRB 181112, FRB 190102 and FRB 190608\\u2014by zooming-in on the radio sky using a detector on the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope in outback Western Australia.

The findings brings astronomers a step closer to understanding the origins of these mysterious signals from outer space.

China outlines ambitious plan to build space station in orbit
Link: https://www.axios.com/china-space-station-56b71c1e-a6f6-4c69-b74e-2975f3e335d1.html

China has an ambitious new plan to build a space station in orbit by 2023.

Why it matters: The U.S. sees China as a rival in space, so any large undertaking like this one will be watched closely.

The space station also represents the evolution of China\'s space program, which made use of two smaller test stations in orbit that hosted crew before moving on to this more complex design.
Details: China plans to launch the first module of its new space station next year, with a total of 11 launches needed to complete the station by 2023, according to a report from SpaceNews.

The station is expected to eventually play host to crews of three astronauts aboard for six months who can perform experiments and other activities from orbit.

It\'s also possible the crewed SpaceX launch could influence the burgeoning commercial space sector in China, according to Cheng.

"The Chinese are worried, not about Elon Musk per se, but they recognize that companies can do entrepreneurship way better than state-owned enterprises," Cheng said.

Is \\u2018Planet Nine\\u2019 Actually A Black Hole In The Solar System? There\\u2019s Only One Way To Find Out
Link: https://www.forbes.com/sites/jamiecartereurope/2020/06/03/is-planet-nine-actually-a-black-hole-in-the-solar-system-theres-only-one-way-to-find-out/#1ef87517ef40

Planet Nine is hypothesized to follow an elliptical orbit around the Sun. It would take the planet between 10,000 and 20,000 years to make one full orbit around the Sun. The planet is estimated to have 5 to 10 times the mass of Earth and a radius of 2 to 4 times Earth\'s.

Is there a \\u201cPlanet Nine\\u201d lurking at the fringes of the solar system? Or could it be something a whole lot more scary\\u2014a primordial black hole?
A new paper by Harvard University undergraduate Amir Siraj and theoretical astrophysicist Avi Loeb (he Mysterious Interstellar Object \\u2018Oumuamua) suggests that a new telescope currently being constructed in Chile could hold the key to discovering whether there is, in fact, a black hole located in our own solar system.
Why do some think that Planet Nine could be a black hole?
\\u201cPlanet Nine\\u201d being a black hole is very unlikely, but no more so than \\u201cPlanet Nine\\u201d existing at all, according to Siraj and Loeb. \\u201cIf it exists and is not a statistical fluke, \\u2018Planet Nine\\u2019 is most likely a planet, not a black hole,\\u201d said lead author Siraj in an email to me last week. \\u201cThere is no unambiguous evidence showing that black holes exist that are less massive than the about mass of the Sun.\\u201d
However, another recent paper showed that the probability of the solar system capturing a free-floating planet at the distance of Planet Nine could be comparable to the probability of gravitationally capturing a black hole with a similar mass.
What is the Rubin Observatory?
The paper suggests that the Rubin Observatory\\u2014which is now in an advanced state of construction close to the Gemini South telescope\\u2014will be able to confirm the existence, or not, of a black hole in the solar system.
The Rubin Observatory is all about wide-angle, real-time astronomy. Its 10-year \\u201cLegacy Survey of Space and Time\\u201d (LSST) survey of the sky will image the entire southern hemisphere night sky every three nights, with each image covering an area 40 times the size of the full Moon.

How to find black hole in the solar system
\\u201cThe LSST will be unique in its ability to survey the entire sky about twice per week at a remarkable level of sensitivity,\\u201d said Siraj. \\u201cWe calculated that the flares from the accretion of a small body onto a \\u2018Planet Nine\\u2019 black hole would be brightest near the optical band, where LSST operates.\\u201d

However, there is one small problem with hunting a black hole. SpaceX Starlink and other upcoming mega-constellations of satellites are said to be particularly problematic for the Rubin Observatory\\u2019s plans to survey the night sky.


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