Instant Index: Princess Diana Photo Mystery

Diane Sawyer reveals the top stories that had people buzzing this week.
1:33 | 01/04/13

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Transcript for Instant Index: Princess Diana Photo Mystery
And here's what we were all talking about today. Our instant index, starting with a royal mystery. Solved. An old photo surfaced today of princess diana, there she is, 19 years old, before her marriage to prince charles. She's seen with a mysterious young man, the words on the picture, not to be published. So we did some detective work and found adam russell. It was a ski trip with friends. Both had been injured. Adam reportey smitten. She was not. And we know what happened next. AND WHY is McDreamy himself a local hero at a coffee shop in seattle? The "grey's anatomy" star stepping in to save the coffee chain tully's, pushing back against the goliath starbucks. He's going to keep the chain going even if it means getting behind the counter and serving coffee hlf. Tonight we answer the question, how big were the new year's eve fireworks on the surface of the sun? Take a look. The solar flare powering its plasma 160,000 miles high. For perspective, this is our little earth super imposed next to that flare, which was 20 times bigger than our tiny planet. Sending a message about size from the galaxy. If you see something out there that is crackling for you, send it to our instant index. Tweet it to me at diane sawyer.

This transcript has been automatically generated and may not be 100% accurate.

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