• Categories

  • Most Popular Questions

  • Recently Viewed Questions

  • Recent Answers

    Daigrepont on Can an earthquake cause air tu…
    Benedict on How did God come into exi…
    joshua on How does the human body g…
    Ian on How did God come into exi…
    Sidra on How did God come into exi…
  • Recent Questions

  • Blog Stats

    • 2,164,682 hits
  • Visitors since 11-3-08

    counter create hit
  • Terms and Conditions

  • Warning

    We are doing maintenance on this site, so some posts may disappear for a short time. Sorry. Normal service will soon be resumed...
  • Pages

  • March 2008
    M T W T F S S
    « Feb   Apr »
     12
    3456789
    10111213141516
    17181920212223
    24252627282930
    31  
  • Archives

  • Meta

How long will the earth last for?

How long will the earth last for?
Kezia from Cumbria (Aged 5-14)

Advertisements

One Response

  1. Assuming we aren’t destroyed by a random and unpredictable event such as a very large object hitting our planet, Earth should be around for quite some time. However, it won’t always stay the way it is today, and it all depends on the Sun.

    The Sun is actually getting steadily hotter. Not so much that over our life-times, or even over the time humans have existed, we would notice, but it has been happening. Scientists currently believe that within about 900 million years the Sun will become too hot for life as we know it to survive on Earth. Within another billion or so years there’s unlikely to be any liquid water (essential to all living things we know about) left on Earth.

    Eventually, about 5 and a half billion years from now the Sun will expand to become a red giant, and it’s diameter will increase to beyond Earth’s orbit. If Earth is still in (or close to) this orbit it will be obliterated. However, the Sun is steadily losing mass as it converts it to energy and as matter is blasted away from it’s surface. If it’s mass decreases then so does it’s gravitational pull on the planets, so Earth’s orbit will probably expand, taking it further away from the Sun.

    Whether this will mean Earth will escape the red giant is something astrophysicists are still trying to determine, though by this point Earth will have been uninhabitable for billions of years.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: