An eighth planet has been discovered at the star Kepler-90. This makes the Kepler-90 star similar to our sun with the number of planets in the Kepler-90 system equal to the number of planets in our solar system. https://arxiv.org/abs/1712.05044
Of course, if you consider dwarf planets like Pluto to be actual planets, then our solar system has the most planets.
Yeah, since we cannot yet detect exoplanets smaller than the Moon, it makes little sense to compare the number of known planets + dwarf planets in the solar system to any other system. If we could, our system's status of "having the most" would probably be lost very quickly.
We also can't detect planets which are very far from the star, like Uranus and Neptune. So systems like Kepler-90 may actually have more planets. Compact systems with many planets packed inside Mercury orbit probably have no external planets (or have just few of them). We can roughly estimate "is the system map complete" by summing up the masses of all known planets and dividing them on mass of the host star. If it is greater than 0.002, this may indicate that star has no unknown gas giants at the least (but still may have smaller planets of course). This is the upper limit on the mass of the protoplanetary disk.
Time to fix that distance bug for hyper-faraway custom systems?
(Just joking, no worries. )
Last edited by PlutonianEmpire on 05 Feb 2018 10:50, edited 1 time in total.
Specs: Dell Inspiron 5547 (Laptop); 8 gigabytes of RAM; Processor: Intel® Core™ i5-4210U CPU @ 1.70GHz (4 CPUs), ~2.4GHz; Operating System: Windows 7 Home Premium 64-bit; Graphics: Intel® HD Graphics 4400 (That's all there is )
Specs: Dell Inspiron 5547 (Laptop); 8 gigabytes of RAM; Processor: Intel® Core™ i5-4210U CPU @ 1.70GHz (4 CPUs), ~2.4GHz; Operating System: Windows 7 Home Premium 64-bit; Graphics: Intel® HD Graphics 4400 (That's all there is )
All planets are most likely SE terra class, with a densities range from 3.4 (like Moon) to 5.6 (like Earth). Smallest planets certainly have large amounts of volatiles, probably water or ice.
Edit: the plot from the article is more informative. It shows that only planet e resembles Earth and Venus by composition, others seems to have significant amounts of water, or abnormally small metallic core.
[quote="SpaceEngineer"][quote="PlutonianEmpire"][post]18441[/post] It seems we have found extra-galactic worlds now.[/quote] [url=https://en.wikipedia.org/wiki/PA-99-N2]https://en.wikipedia.org/wiki/PA-99-N2[/url][/quote] Multiply that by a couple thousand. https://www.seeker.com/astronomy/thousa ... first-time
------------------------------------------------------ Merged from the "What do you think about the super flare of the star Proxima Centauri?" topic ------------------------------------------------------
Hi guys, I hope you are doing well
So.. the other day I read that Proxima Centauri released a huge flare last year, decreasing the chances of existing life in Proxima b What do you think about it? I also read that the flare lasted 2 minutes.. what if the flare happened in the part of the star that was not facing Proxima b? Proxima Centauri rotates every 82 days.. I think that maybe the flare might have been released on the oposite side towards empty space (or other exoplanets) I recently made a new video on the top 5 potentially habitable exoplanets closest to Earth in 2018 (here it is: http://www.youtube.com/watch?v=Pd6smyz2tUk&list=PL3RiFKfZj3pv1ZqpFxuZinoGtUGEOank) in which I included Proxima b because it is still considered the one with the highest earth similarity index. Do you think that Proxima b should not be considered a potentially habitable exoplanet anymore? Should the target of the Starshot project be changed?