SUMMARY: Both Hubble and the Spitzer Space Telescope have provided astronomers with a view of planetary systems forming around other stars similar to our own Sun. Hubble viewed a young star, only 50 to 250 million years old, which could have gas giants, but its rocky planets would still be forming. This could be a view into what our Solar System looked like when it was first forming. Spitzer found 6 much older stars with planetary disks; closer to 4 billion years old, which is the age of our Sun. These stars are known to have gas giants, and probably have rocky planets as well.
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