Can Earth be seen from Mars?

A human observer with normal vision, if standing on Mars, could easily see Earth and the moon as two distinct bright evening 'stars'. When Curiosity took the photo, Earth was about 99 million miles (160 million kilometers) from Mars.

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What if the Sun died?

After the Sun exhausts the hydrogen in its core, it will balloon into a red giant, consuming Venus and Mercury. Earth will become a scorched, lifeless rock - stripped of its atmosphere, its oceans boiled off. While the Sun won't become a red giant for another 5 billion years, a lot can happen in that time. Will Earth go into a black hole? Will Earth be swallowed by a black hole? Absolutely not. While a black hole does have an immense gravitational field, they are only "dangerous" if you get very close to them. It would get very dark of course and very cold, but the black hole's gravity at our distance from it would not be a concern.

Consequently, can we live without the sun?

Without the Sun's rays, all photosynthesis on Earth would stop. While some inventive humans might be able to survive on a Sun-less Earth for several days, months, or even years, life without the Sun would eventually prove to be impossible to maintain on Earth. Consequently, is earth the only planet that can support life? Yet Earth remains a standout, and so far, one of a kind. Of the thousands of exoplanets ? planets around other stars ? confirmed by our increasingly powerful telescopes, and despite extensive probing of the solar system, ours is still the only planet known to host life.

Also, which planet is the best to live on?

Mars is the best planet because Mars and Earth have more in common than any other worlds in the solar system. It cowers next to humongous Jupiter, but unlike that gas giant, its hard surface beckons visitors.