Linked Questions

5
votes
4answers
1k views

How do we not know what's in the Solar System? [duplicate]

It seems every once in a while there's a claim of a new planet in the Solar System. I don't understand how local planets can stay undiscovered for this long when astronomers are accomplishing what ...
4
votes
1answer
281 views

If thousands of exoplanets have been discovered, why haven't we discovered planet 9 yet? [duplicate]

According to NASA, we've discovered 3,453 exoplanets so far [1]. With some of the farthest being at 13,000 light years away [2]. This would suggest today scientists have a really advanced capability ...
3
votes
1answer
171 views

Is there likely other significant objects we haven’t discovered in the solar system? [duplicate]

In the last few weeks, I read a few news that presented new advances in our understanding of the solar system, which implied we don’t really know our neighboorhood that well. I was wondering, how ...
32
votes
3answers
2k views

If Alpha Centauri A's solar system exactly mirrored our own, what would we be able to detect?

Suppose there was an exact replica of our solar system 4.4 ly away (people included). What would we be able to detect and with what telescope(s)? Which planets? Could we detect radio transmissions and/...
15
votes
3answers
2k views

What wavelength to best detect the "9th planet"?

We know that the reflected sunlight will make detecting the 9th planet very difficult in the visible light. Is there another band that will be more likely to detect it? What is the surface temperature ...
20
votes
2answers
850 views

Hypothetical trans-Neptunian planets orbiting the Sun

The planet HD 106906 b was found at 650 AU from its home star, a star not so different from the Sun. Fomalhaut b is also a young planet that is orbiting very far away from its star. These two planets ...
18
votes
2answers
618 views

How long should it take for us to observationally determine if Caltech's Planet Nine is really there?

Caltech just released a report that says there is possibly a large (10 earth mass) planet in a remote orbit (10 - 20 thousand year) that explains a lot of observations of Kuiper Belt objects. How long ...
10
votes
1answer
304 views

If Planet Nine indeed exists, how large a impact event there should be to be seen from Earth?

Recently I've found this news article, A meteorite crashed into the Moon during total lunar eclipse in January, about a collision into the moon that happened while a lunar eclipse was under way. ...
5
votes
2answers
153 views

Which kind of strategy should we take to discover Planet 9 and other KBOs?

What are the differences between the discoveries of Sedna, 2012vp 113, and the supposed Planet 9? All need deep infrared surveys at the ecliptic plane, but P9 needs a much deeper survey?
1
vote
1answer
171 views

What is the LSST now? Where does LSST end and Vera C. Rubin Observatory begin?

Space.com's It's Official: Vera Rubin Observatory Named to Honor Dark Matter Scientist says: "We're here today to focus on the major renaming of the facility after a pioneering astronomer, that ...
1
vote
1answer
148 views

Is there or will there be any search after a primordial black hole 500 au from the Sun?

Since 2019 it is proposed that the hypothetical Planet IX may in fact be a primordial black hole. Black holes are being looked after differently than planets. You can look for a gravitational lens or ...
0
votes
0answers
45 views

If Planet 9 is a primordial black hole with a mass of 5 Earth, is it possible to detect it in a ground telescope? What should we seek in this case? [duplicate]

If planet 9 is not a planet but a black hole how can we find it? Can we see gravitational lense or infrared/gamma light?