edmond halle died without seeing one.l half a century until he published his theory, but this theory was right and it teaches us all that stuff. the last time it happened was in the 1800s, buts the about to happen again. since we are the kind of tv show that has a really friendly in-house astrophysicist to explain things like this. watch. >> venus transitting the sun is going to look like that. >> like a little raisin or tick. >> tiny, you won't be able to see it with your eyes, but you can see it with a telescope. you should not try to see it with your naked eye ever. i will hunt you down and hurt you, but venus will move across the disk of the sun. and this is so cool because it only happens every 120-ish years. it happened in 2004. so if you missed that, you really have to see it again this year. and it is not going to happen again until 2117. >> so tuesday is your big chance. >> tuesday is your big chance. >> tuesday is your big chance. that's laura conoway talking to summer ash, the in-house astrophysicist rep. we'll

. >> narrator: with his mother waiting down the hall tyler edmonds is making a critical decision, telling sheriff's deputies he's responsible for killing his brother-in-law just west of starkville, mississippi. >> i was just holding the gun. i heard it go off, and i looked at him, and saw it actually hit him. >> narrator: but tyler will later insist the confession is false, a misguided effort to protect the person he calls the real killer, his half-sister kristi fulgham, the victim's wife. >> i believe the confession. >> narrator: to tyler's mother sharon clay, though, the police acted unethically. >> they had obviously done this behind my back and that was a violation of my rights as tyler's parent. >> he said, we just need to talk to him for a minute. well, 45 minutes later, i start looking for tyler. and that's when i got to the door where they had interrogated him and taped the confession. >> tyler, don't sign anything. >> i signed another one of those papers that i -- >> without me? >> will y'all step outside? we'll call you when we're finished. >> i mean, are y'all doing the stateme