At last, someplace fairly comfortable. Very weak gravity is holding you to the surface of the small object on which you sit. Your object is apparently moving away from a star, perhaps one that it orbits with a period of thousands of years. Around you, geysers are spouting gas into space. Looking back along the object's orbit, you see particles of dust that the geysers apparently blew off the object when it was nearer to the star that it is now leaving behind. You conclude that the geysers were recently much more active but are now settling down into a quiescent state that may last for millennia. You also soon realize that you are closer to home than you have been in all your previous journeys. Perhaps if you can somehow find a small rocket, a heat shield, and a good parachute, you can escape and head home for your final exam. Where are you?

Question

BlackTom AI · Accepted Answer

Let's break down what the prompt describes and examine each answer choice in turn, highlighting why some fit and others do not.

Option a: You are in the universe shortly after inflation. This statement would place you in a cosmological setting well outside any planetary body, with extreme conditions not resembling a small object with geysers and dust trails orbiting a star. The scene described—low gravity, geysers ejecting material, dust left along an orbit, and an object relatively close to home compared to prior journeys—does not match the post-inflation universe scenario. Therefore, this option is inconsistent with the given vivid, near-solar-system details.

Option b: You are at Disneyland on the Moon, riding the new "wild and wet" roller coaster. Although playful, this choice ignores the geophysical cues in the description, such as very weak gravity on a small object, geysers actively spouting gas into space, dust trails along an orbital path, and the implication of a natural body with outgassing rather than a manufactured amusement ride. The narrative emphasizes a natural celestial body, not a fictional ride, making this option implausible.

Option c: You are on comet Hale-Bopp, circa May 1997. Here the setting aligns well with the clues: a small body with very weak gravity, geysers (outgassing) releasing gas into space, dust particles shed when the comet was nearer the Sun, and a trajectory away from the star consistent with a long-period comet traveling through the outer solar system. The mention of approaching home and the hint about needing a rocket, heat shield, and parachute to escape for a final exam fits a cometary mission-like scenario during the late 1990s when Hale-Bopp was a prominent comet active around that era. This option coheres with all the observational cues described.

Option d: You have been shrunk in size and are riding a grain of interstellar dust that is carrying you on an orbit about our very own Sun. While imaginative, this choice conflicts with the tangible features of the scene: very weak gravity on a small object is described as if you are on the surface of the object, not riding a microscopic grain. Additionally, comet-like outgassing and dust ejected from a body in orbit are characteristic of a solar-system object, not a microscopic dust grain orbiting the Sun. Thus, this option does not fit the described macroscopic scenario.

Option e: You are riding a jet of gas from a quasar that is headed in the direction of an ordinary star. Quasars emit enormous jets of material and energy, but the context here emphasizes a nearby star, a small object with solid gravity, and geysers on a solar-system–scale body. A quasar jet interaction would not produce the described dust trails and the sense of a small object leisurely moving away from a star in a planetary-like orbit. Therefore, this option is not compatible with the scenario.

In summary, each option is weighed against the specific cues: weak gravity on a small body, geysers outgassing into space, dust trails from prior proximity to a star, and the implication of a solar-system vicinity with a potential homeward turn. The one narrative that consistently matches all these solar-system features and the timeline (May 1997, Hale-Bopp’s active phase) is option c, while the others fail to align with the observed physical context or scale.

ASTR 350 ONL FA25: Big Bang,Black Holes,Universe (Liu, X)

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