Artificial detonation of gas giant planets is hypothetically possible (writing a draft about it now).
An impact of a large comet-like body (100-1000 km in size) with the Sun could produce a massive solar flash or flare.
SETI-attack—we find an alien signal which has a description of hostile AI.
UAP-related risks, which include alien nanobots, berserkers
A list of different risks connected with extraterrestrial intelligence.
The Big Rip—exponential acceleration of space expansion, resulting in the destruction of everything within 10 billion years.
A collision with another brane in 4D space.
An encounter with a cloud of supernova remnants containing radioactive elements.
Impact risks: Dark comets.
Impact risks: Passing through a comet’s tail filled with many Tunguska-sized objects.
Artificial impact billiards.
Phobos falls on Mars, creating a large debris field that reaches Earth.
Chaotic perturbation of planetary orbits results in a collision with Venus in 100 million years.
High-speed impactors (natural or artificial, with speeds exceeding 100 km/sec) produce nuclear reactions in the atmosphere, resulting in global radioactive contamination.
A small primordial black hole becomes trapped inside Earth.
A neutrino shower from a supernova causes significant DNA damage to most living beings through elastic impacts (I think I saw an article about it).
Space dust from colliding objects blocks the Sun in the ecliptic plane, resulting in a severe “nuclear” winter on Earth.
Gravitational waves from a black hole merger damage Earth.
Several possible additions:
Artificial detonation of gas giant planets is hypothetically possible (writing a draft about it now).
An impact of a large comet-like body (100-1000 km in size) with the Sun could produce a massive solar flash or flare.
SETI-attack—we find an alien signal which has a description of hostile AI.
UAP-related risks, which include alien nanobots, berserkers
A list of different risks connected with extraterrestrial intelligence.
The Big Rip—exponential acceleration of space expansion, resulting in the destruction of everything within 10 billion years.
A collision with another brane in 4D space.
An encounter with a cloud of supernova remnants containing radioactive elements.
Impact risks: Dark comets.
Impact risks: Passing through a comet’s tail filled with many Tunguska-sized objects.
Artificial impact billiards.
Phobos falls on Mars, creating a large debris field that reaches Earth.
Chaotic perturbation of planetary orbits results in a collision with Venus in 100 million years.
High-speed impactors (natural or artificial, with speeds exceeding 100 km/sec) produce nuclear reactions in the atmosphere, resulting in global radioactive contamination.
A small primordial black hole becomes trapped inside Earth.
A neutrino shower from a supernova causes significant DNA damage to most living beings through elastic impacts (I think I saw an article about it).
Space dust from colliding objects blocks the Sun in the ecliptic plane, resulting in a severe “nuclear” winter on Earth.
Gravitational waves from a black hole merger damage Earth.