The biggest planet in the universe

Unknown at this point.

A lot depends on how one defines "planet". If a planet gets large enough, maybe several times the mass of Jupiter, it starts to slide into "brown dwarf star" territory. These are objects classified as "stars" rather than "planets", but that aren't massive enough to sustain fusion reactions at their core.

There are probably lots of these. Probably some of them orbit around more massive stars and satisfy that criterion for being a "planet".

So my opinion is that the dividing line between "planet" and "star" is kind of vague and arbitrary and there are probably countless objects that straddle that gap.



Probably not. I'd guess that these kind of objects are more along the lines of our solar system's gas giants. They may indeed have iron cores though.
I'll all that support for what passes as technical aspects of my #5.
 
Sorry my last post had some text input issues. Corrected response:
"I'll take that as support for what passes as technical aspects of my #5."
And of course your mention of needing to orbit a bona fide (not necessarily shining brightly) star is relevant to the whole definition. Except, spanner in the works - the concept of planetary bodies freely wandering in interstellar space has for quite some time become accepted as fact or near certainly so. The astronomical zoo keeps expanding
 
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UY Scuti is the biggest star.
But it is a massive fireball with hydrogen and helium.
No solid in the star.

Any star contains solid materials?
 
Yes, short of drinkable water also, food also becoming shortage,
inflation is coming,
more unemployment.
We need a bigger Earth to live.
 
Yes, short of drinkable water also, food also becoming shortage,
inflation is coming,
more unemployment.
We need a bigger Earth to live.

No, no. Goals like the latter are the fruit of political heathenism.

According to activist movements that are piously devoted to our best interests, we should remain here on Earth. Both enduring and addressing/remedying the baleful consequences and conditions we have brought on ourselves.

Not wastefully spending money and using resources to explore space, and settle beyond Earth (like the tyrant Elon exemplify), since that would simply be a revival of Western colonialism (systemic bigotry, white privilege, Eurocentric philosophy and science, etc).

And a continuance of the plundering and befouling of evil capitalism and meritocracy let loose upon the galaxy. (Let us pause and praise the moral rule of the intellectual class [philosopher kings] and the holy revelation of cultural hegemony, with regard to interpreting all that transpires today, revealing the deep varieties of wickedness and injustice manifest in the Western tradition.)

Nah... More likely -- granting that we haven't been replaced by various technological species by then -- we would settle other space bodies, anyway. But simply take the burdensome wondrous bureaucracy of Leftangelical utopian idealism and the saintly posturings of the Church of Woke along with us to manage and limit the sins against ourselves and natural environments.

We need a more egalitarian approach to space exploration
https://aeon.co/essays/we-need-a-more-egalitarian-approach-to-space-exploration

Closing prayer: "Hallelujah, blessed be Father Karl, and the ancestral motherhood of the New Left expanding beyond the initial prole fixation, and postmodernism, neo-pragmatism, and their joyous contemporary offspring crusades devoted to the salvation of the world. Goodness, how much we ache for the forgiving foot of a Hollywood celebrity saint of great social virtuousness for us to kiss right now, and wash away the fetid soil of our opportunist mentality."
 
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