Mitä jos sikariasteroidi törmäisi Maahan?

Oumuamua on ehkä hieman huono esimerkki asteroiditörmäyksen uhasta, koska siihen liittyy niin paljon outoa. Uusimman oletuksen mukaan, se olisikin erittäin harvaa höttöä oleva tähtienvälinen lumihiutale.

https://www.syfy.com/syfywire/no-oumuamua-is-not-an-alien-spaceship-it-m... .

https://arxiv.org/pdf/1902.04100.pdf .

COULD 1I/’OUMUAMUA BE AN ICY FRACTAL AGGREGATE EJECTED FROM A PROTOPLANETARYDISK? A FLUFFY RADIATION-PRESSURE-DRIVEN SCENARIO

...Here  we  assess  whether  theinternal  structure  of  1I/’Oumuamua,  rather  than  its  geometry,  could  support  a  radiation-pressuredriven scenario.  We adopt a mass fractal structure and find that the type of aggregate that could yield the required area-to-mass ratio would have to be extraordinarily porous with a density∼10−5gcm−3. Such porous aggregates can naturally arise from the collisional grow of icy dust particles beyond the snowline of a protoplanetary disk and here we propose that 1I/’Oumuamua might belong to this population...