From Max Planck Society: “There is as yet no explanation as to how a body as flat as Arrokoth could emerge from this process,” says Rezac. ” Note: No one has so far claimed that it an “extraterrestrial lightsail.” Or a space alien’s experiment. What’s going wrong here? 😉
Tag: solar system
Claim: Solar system might once have had two companion stars
But wait! Who’s claiming this? The second author of this paper is Abraham (Avi) Loeb. That rings a bell. Wasn’t he the one who suggested that the obvious space junk Oumuamua was an extraterrestrial light sail? Look, why does the name “Harvard” put all doubts about credibility to rest? Especially in these times?
Guillermo Gonzalez: Earth’s position makes space exploration easier
Gonzalez: In the larger context of the Milky Way galaxy, our Solar System is in the best location to initiate interstellar missions. In summary, we here confirm and expand upon recent studies that argue that the Earth and the Solar System are rare in the degree to which they facilitate space exploration.
Galileo’s contemporary science opponents made a lot of sense
Christopher Graney: “… seen from Earth, stars appear as dots of certain sizes or magnitudes. The only way stars could be so incredibly distant and have such sizes was if they were all incredibly huge, every last one dwarfing the Sun. Tycho Brahe, the most prominent astronomer of the era and a favourite of the Establishment, thought this was absurd, … ” The true history is a warning to thoughtful people to avoid popular science written by the village atheist; he knows just enough to get it all wrong.
Earth’s rocks and Moon rocks differ—possibly shedding light on Moon origin
That may help us understand how the Moon formed, say researchers. Yes, that seems odd, but the we know surprisingly little about how the Moon—which plays a very important role in enabling life on Earth—was formed.
Ring-like structure in early solar system proposed to explain the inner rocky planets
One team of researchers doesn’t think Jupiter has been doing all the heavy lifting.
If there IS a ninth planet out there…
Not Pluto (it was downgraded in 2006). What do you want to bet that the Big Ninth will turn out to be an instance of fine-tuning?
New theory of the Moon’s formation addresses huge discrepancy
If the Moon was really formed when the early Earth was hit by a Mars-sized object, it should mostly be the detritus of that object. But it is mostly Earth stuff. So…
50th anniversary of Apollo 8: Earth as a privileged planet
We know far more about that now than we did then.
Our solar system is a lot rarer than it was a quarter century ago
Two independent teams of astronomers recently looked into the matter: Astronomers have detected and measured the mass and/or orbital features of 3,869 planets in 2,887 planetary systems beyond the solar system. This ranks as a staggering rate of discovery, given that the first confirmed detection of a planet orbiting another hydrogen-fusion-burning star was as recent Read More…
We look for planets differently now
It turns out that other solar systems are not shedding much light on how ours came to be: But as the menagerie of young planetary systems grows, researchers are struggling to square their observations with current theories on how our Solar System and others formed. Such ideas have been in turmoil ever since astronomers started Read More…
Moonmoons
You read the title right. Recently, some astronomers thought they had spotted an “exomoon,” a moon orbiting an exoplanet. There are, of course, bound to be some. But now Gizmodo introduces us to the concept of the moonmoon, a submoon orbiting a moon. One research team is taking on the possibility: The team’s short analysis Read More…