I remember my teacher rolling in a tiny TV on a huge cart so we could watch NASA launch a rocket into space. We spent what seemed like hours just waiting for those few explosive seconds.
I'm not sure why but it does not seem many of these launches are covered anymore and that is really unfortunate.
A few minutes ago Aidan, my 10 year old son, noticed that SpaceX was going to launch in less than an hour. He assumed it would be on TV but I'm pretty sure it won't. We have never had cable so that isn't an option.
I stumbled across the NASA live site. We discovered they live stream a lot of these launches. Check their website, maybe your students would be interested.