Next week, millions of people across North America will be able to see a total solar eclipse, a once-in-a-lifetime experience for many. A total solar eclipse - where the moon moves in front of the sun - happens about every 18 months. However, it rarely takes place over land, so next week's is an incredibly rare opportunity for scientists and amateurs alike to witness the phenomenon.On the Sky News Daily, our data and forensics correspondent Tom Cheshire chats to NASA's deputy administrator and retired astronaut Pam Melroy about why solar eclipses are so important for scientists and learning more about the Earth and our nearest star.In addition, our science and medical correspondent Thomas Moore explains why eclipses happen - and why the vast majority in the UK won't be lucky enough to see it.You can watch our live coverage of the total eclipse on Monday 8th April, 7pm to 10pm, on the Sky News channel, the Sky News app or on our YouTube channel. ? Listen above then tap here to follow the Sky News Daily wherever you get your podcasts ? Producers: Rosie Gillott & Soila Apparicio Assistant producer: Iona Brunker Interviews producer: Melissa Tutesigensi-Charles Podcast Promotions Producer: David Chipakupaku Editor: Philly Beaumont