Asteróides vieram de 5 planetas?

https://www.thetimes.co.uk/article/most-asteroids-come-from-only-five-ancient-planets-5t92g3g06

Citando:
"

The vast majority of asteroids and meteorites are the shattered remains of five small planets that existed when the solar system was newly formed, astronomers have found.

These celestial bodies, which would have been comparable in size to moons, were broken up in a destruction derby of colliding rocks until all that survived were at least 400,000 much smaller lumps.

This model of the asteroids’ history should help scientists to predict when they are likely to pose a threat to the Earth.

In the inner asteroid belt are five large objects — Flora, Vesta, Nysa, Polana and Eulalia — each surrounded by an associated “family” of rocks that appear to have been chipped from its parent body billions of years ago."

O senhor ex-Microsoft, a NASA e as estimativas erradas?

https://www.theguardian.com/science/2018/jun/24/nathan-myhrvold-inventor-microsoft-patent-nasa-asteroid-data-pizza-science

Citando:
"Nasa’s Wise space telescope [Wide-field Infrared Survey Explorer] measured the asteroids in four different wavelengths in the infrared. My main beef is with how they analysed that data. What I think happened is they made some poor choices of statistical methods. Then, to cover that up, they didn’t publish a lot of the information that would help someone else replicate it. I’m afraid they have both over- and underestimated. The effect changes depending on the size of the asteroid and what it’s made of. The studies were advertised as being accurate to plus or minus 10%. In fact, it is more like 30-35%. That’s if you look overall. If you look at specific subsets some of them are off by more than 100%. It’s kind of a mess."

Plano da NASA para asteróides

https://www.thesun.co.uk/tech/6587550/nasa-plan-defend-earth-asteroid/

Citação:
"Nasa’s five-step plan for saving the Earth from space death

In the 18-page plan, Nasa outlined five key ways it would avoid the total destruction of Earth and all human life."

NASA visita mais dois asteróides (missão planeada)

Eis o porquê?
http://mobile.abc.net.au/news/2017-03-06/16-psyche-asteroid-like-no-other-metal-world-nasa-mission/8316054?pfmredir=sm

Aviso contra asteróides (NASA)

5 dias é melhor que um, pior que trinta?
http://www.aol.com/article/2016/11/01/nasas-asteroid-detection-system-gives-5-day-warning/21596383/