Podcaster: Pamela Quevillon
Title: The Future is Bright
Organization: Speak Easy Narration
Description: Space scoop, news for children. Today’s we bring you the fate of the Sun
Bio: Pamela Quevillon is a voice actress who most often lends her voice to science and science fiction content. You can find her work on the “Escape Pod” and “365 Days of Astronomy”
Today’s sponsor: This episode of “365 Days of Astronomy” is sponsored by — no one. We still need sponsors for many days in 2013, so please consider sponsoring a day or two. Just click on the “Donate” button on the lower left side of this webpage, or contact us at firstname.lastname@example.org.
The Sun looks so calm and peaceful in the sky but its light is immensely powerful. It sustains all life on Earth and it can be very harmful to stay out in it for too long. To study the Sun, astronomers have built special telescopes to safely view it. But we’ve only had these for a few hundred years. This means we’ve only been studying the Sun for a tiny part of its life. Without a time machine it’s really hard to study what our star was like in the past, or what it will be like in the future. To get around this, astronomers look for stars that are as similar to the Sun as possible, but at different points in their lives. We call these stars “solar twins”. This picture shows a selection of them; ranging from the youngest on the left to the oldest on the right. Studying these rare “solar twins” allows astronomers to see what our star used to be like, and what it will be like in the future.
Not very far from Earth (compared to the huge vastness of space) astronomers have just discovered the oldest solar twin ever! The star is almost double the age of the Sun: at 8.2 billion years old it is 2/3rds the age of the Universe. The star is called HIP 102152 and you can see it labelled to the right of this picture. This solar twin gives us a great opportunity to see what the Sun will be like when it gets old!
So, what will the Sun be like in 4 billion years? Well, it will be much brighter for a start. By this time the Sun will be so hot that Earth’s oceans will have boiled away. The ice caps will have melted forever and snow will be ancient history. Like our neighbouring planet, Venus, Earth will become a dry, empty landscape unable to support life of any kind. But you’re not planning on living that long anyway, right?
A final twist in the story is that both the Sun and its new solar twin show an unusually small amount of certain chemicals. These are the chemicals that are common on Earth. This is a clue that this alien star might also be the parent of several rocky planets!
365 Days of Astronomy is a community podcast made possible thanks to the contributions of people like you. Please consider donating at 365DaysofAstronomy.org/Donate
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365 Days of Astronomy
The 365 Days of Astronomy Podcast is produced by the New Media Working Group of the International Year of Astronomy 2009. Audio post-production by Preston Gibson. Bandwidth donated by libsyn.com and wizzard media. Web design by Clockwork Active Media Systems. You may reproduce and distribute this audio for non-commercial purposes. Please consider supporting the podcast with a few dollars (or Euros!). Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org. In the new year the 365 Days of Astronomy project will be something different than before….Until then…goodbye.