gas giants?

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No, but you're on the right track, sort of at least.

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Will this require a bright answer? (or delta bright answer)

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"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.

Terrestrial planets ?

The answer of gas giants is warmer, so to speak, than the answer of terrestrial planets but think far, far bigger.

Dave Mitsky

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Planetary nebula?

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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.

None of these objects have gotten that far yet but four of the others have.

Dave Mitsky

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Spacecraft? 4 of them (Pioneer 10+11, Voyager 1+2) have left the solar system.

Though I'm not sure about this as there may not be a consensus definition of solar system boundaries.

Plus as you said, think bigger. Spacecraft tend to be smaller than gas giants.

There is a relatively new class of stars that produce a blast of light for no known reason. V838 Mon is one of these and there is at least one other, so maybe now there are four total.

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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.

Gotten that far yet doesn't imply traveling through space in this case.

George is now on the right track but one must think collectively to reach the correct answer.

Dave Mitsky

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White dwarves

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Does it have anything to do with novae

Is it about a bicycle?

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Collectively as in stars in a group but that's only part of the answer. What do these groups lack when compared to other members of a collection of objects that are related in a historical manner?

Is that confusing enough without giving it away outright?

Dave Mitsky

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Assuming it has nothing to do with a bicycle (I have no idea where Eroica is going with that), does the answer involve the Messier catalog?

Yes, or perhaps I should say oui, there is definitely a "French Connection"!

Dave Mitsky

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I like the bludgeoning method still....

Globular clusters would fit the "stars in a group" easy enough. There are certainly many Messier objects that fit that bill, but Dave has added unusual emphasis with his "French Connection" phrase. I can't imagine any drug reference. Hmmmm.

Recently, APOD showed a video of numerous stars that brightened significantly, and do so nightly, in M3. Perhaps three other clusters show these fast cycle stellar brighteners.

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Lighten up! This is a stellar board! Author: duh.

"The Sun, with all the planets revolving around it, and depending on it, can still ripen a bunch of grapes as though it had nothing else in the universe to do..." Author: Galileo supposedly.

George,

There was no "unusual emphasis" intended. I was planning on using The French Connection as a clue at some point to refer to Charles Messier so I threw it in at that juncture.

I think that a clarification is in order. The four objects all have a general similarity in that they are comprised of more than one star. However, that is really irrevelant to the answer. All four of them have something in common that makes them different from the rest of the Messier objects.

Dave Mitsky

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Just a guess:
M27, M57, M76 and M97; the four planetary nebulae of the Messier catalog?

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good answer.

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"I will do my best to understand and explain the universe from big to small without invoking miracles, unrepeatable events, or divine intervention. In place of those things I will use observations, mathematics, and science."


-Cross
My travel blog

Some of my Astrophotography


Those that lack education have a hard time understanding its value. - Cross

Well, it's already been established that these objects consist of more than one star and have not evolved to the planetary nebula stage. The "four of the others" that I mentioned earlier are, in fact, M27, M57, M76, and M97.

I'll drop a hint that dwelling on their physical characteristics is heading down the wrong path.

Dave Mitsky

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De gustibus non est disputandum.
Never attribute to malice that which can be adequately explained by stupidity.