The Earth must follow the loop of Nature: The Sun dies, the Earth will soon follow.
Aliens' civilizations may not achieve the necessary scientific progress, such as space movement or interstellar communication to be discovered by us.
Scientists in Japan recently discovered a 720,000-year-old ice core that could predict the climate situation on Earth.
Whether, after 50,000 years, our Earth will
Hawking said that the Earth could become the second Venus with the ocean depleted and acid rain due to climate change.