• Question: I've heard that our galaxy was in a different part of the universe when the dinosaurs lived, It’s true and how do you know?

    Asked by anon-225816 to Sameed, Jose, joannabarstow, Heidi, Freya, Chris on 19 Nov 2019.
    • Photo: Joanna Barstow

      Joanna Barstow answered on 19 Nov 2019:

      The Universe is expanding, so it will have changed since the dinosaurs lived, yes. We know it is expanding because when something that shines is moving away very fast, the light waves coming from it get stretched out and the light looks redder. If we look at other galaxies and measure how red they look, we can tell how fast they are moving. The furthest galaxies are moving the fastest, so they look the reddest. That’s how we know the Universe is expanding.

    • Photo: Sameed Muhammed

      Sameed Muhammed answered on 19 Nov 2019:

      Also, interestingly, our sun was in a different part of our galaxy, the Milky Way, when dinosaurs lived. This is because the sun is also rotating around the center of our galaxy, so now, after many millions of years have passed, the sun is in a different place than it was before.

Comments