Interstellar Comet 3/I ATLAS: Alien Spaceship or Just a Rock?

Comet 3/I ATLAS: Initial Observations and Speculation

• 🌠 Comet 3/I ATLAS was discovered a month ago, traveling at exceptionally high speeds through our solar system.
• 👽 While some scientists, like Avi Lobe, have suggested it could be alien technology, the speaker finds no direct evidence for this.
• ⚠️ The argument for alien origin often relies on calculating low probabilities for various factors, but these calculations are flawed due to non-independent probabilities and selective data.

Debunking 'Unnatural' Trajectories

• ⚡ A key argument for alien origin is the difficulty in imagining a natural process for its high velocity (over 60 km/s).
• 🌌 However, the speaker points out that many stars near our sun have similar relative velocities, making such speeds for comets entirely plausible.
• 🚀 The comet's trajectory, when viewed in the context of the entire galaxy, is not as exceptional as it appears within the confines of our solar system.

Size, Impact, and Detection

• ❓ The exact size of Comet 3/I ATLAS remains uncertain due to difficulty in separating the nucleus from potential outgassing or coma.
• 💥 If it were a 10-11 km object impacting Earth, it would be a catastrophic event, potentially worse than the dinosaur extinction, but this size is an upper limit.
• 🔭 The Vera Rubin Observatory observed the comet before its official discovery, highlighting its future role in detecting such objects with greater lead time.

Intercepting the Comet: Challenges and Possibilities

• 🛰️ Intercepting the comet from Earth would require immense velocity or a 'time machine,' according to analyses similar to the speaker's initial calculations.
• 🚀 Intercepting from Mars is more feasible, requiring about 5 km/s, but existing Mars orbiters lack the necessary propulsion capability.
• 💡 A more promising idea involves the Juno spacecraft orbiting Jupiter, which might have residual propellant to alter its orbit and intercept the comet.

Juno Mission Constraints and Future Prospects

• ⚙️ The Juno mission faces funding issues and is slated to end in 2025, with plans for it to impact Jupiter.
• ⚠️ A significant technical hurdle for Juno is the concern about its main engine due to faulty helium check valves, which could lead to an off-nominal fuel ratio and mission failure.
• 🚀 Even with available propellant (estimated 1.3-1.4 km/s), Juno's ability to reach the comet is limited, though new analyses suggest closer approaches are possible with specific departure dates.
• 🌌 The comet's origin and age remain speculative, with possibilities including formation in an earlier galactic era or being ejected at high speed from its parent star, but definitive answers are unlikely with current observation windows.