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Scenario: A star system with multiple planets, in particular a habitable planet which has no axial tilt such as this, and the next planet out being a gas giant.

The gas giant is ignited using a method which does not change its mass such as Thermonuclear ignition.

the orbit of the gas giant is close enough to the orbit of the habitable planet/big enough that, at the closest the two planets can get to each other, the ignited gas giant will increase the average global temperature by 7 degrees Celsius, similar to the difference of Summer and Winter.

The two planets have different years, so that the habitable planet will cool down and heat back up depending on its proximity to the new sun, creating something like seasons (which it did not initially have due to no axial tilt).

Question:

1- is this possible?

2- what effect would the intial ignition have on the habitable planet, I expect the main effects would be to weather and the life already evolved, but I would appreciate hearing about other effects as well if you can think of them.

3- What are the longterm effects on the habitable planet, in particular what would happen as the gas giant moved away from, and back towards the habitable planets.

EDIT: reworded to, I hope, be clearer.

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closed as unclear what you're asking by Mołot, L.Dutch, Rekesoft, Ash, Flummox May 7 '18 at 14:43

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  • $\begingroup$ This sounds like the Ashen plan to save humanity from world hunger in StarGate SG1. $\endgroup$ – EveryBitHelps May 7 '18 at 5:41
  • $\begingroup$ Consider that weather anywhere can create temperature variations much larger than several degrees - any two days could be seven degrees Celsius apart on average and the day-night range could be much larger. This "mini sun" would have minimal effects. $\endgroup$ – StephenG May 7 '18 at 6:30
  • $\begingroup$ How do you plan to turn gas giants into stars?mass requirements are drastically different. $\endgroup$ – Mołot May 7 '18 at 7:13
  • $\begingroup$ @StephenG Im thinking of a global average, similar to summer vs. winter, in my hometown the temperature difference in average high is about 6 degrees Celsius. $\endgroup$ – Jared May 7 '18 at 7:23
  • $\begingroup$ @Molot I am not yet certain, hoping not to resort to "cos technology happened to figure it out magically", but I don't want to change the mass of the gas giant/mini-star either. Thats a question for another time, for the purposes of this question, assume the mass remains unchanged. $\endgroup$ – Jared May 7 '18 at 7:24