4seven 5Action 5SELECT 5STAR 5USA Al Jazeera English Alibi Animal Planet Arirang ARY Digital B4U Movies B4U Music Baby TV BBC Alba BBC Asian Network BBC Essex DAB BBC Four BBC News BBC One BBC Parliament BBC Red Button BBC Scotland BBC Three BBC Two BBC World Service Blaze Bloomberg Boomerang Box Hits Capital XTRA Cartoon Network Cartoonito CBBC CBeebies CBS Drama CBS Justice CBS Reality Challenge Channel 4 Channel 5 Channels 24 Clubland TV CNBC CNN Colors Colors Cineplex Colors Gujrati Colors Rishtey Comedy Central Comedy Central Extra Crime + Investigation Dave Dave ja vu Discovery Channel Discovery History Discovery Science Discovery Turbo Disney Junior DMAX Drama E4 E4 Extra Eden Euronews Film4 Food Network France 24 GB News GEO News GEO TV GOLD GREAT! movies GREAT! movies action GREAT! movies classic Great! Mystery Great! Romance GREAT! tv Heart 80s Heart 90s Heart London Horror Channel HUM Europe Ideal World Investigation Discovery ITV ITV2 ITV3 ITV4 ITVBe LBC LBC News Legend Legend Xtra LFC TV London TV More4 Movies24 Movies24 plus MUTV National Geographic Channel National Geographic WILD NDTV 24x7 New Vision NHK World Nick Jr Nick Jr Too Nickelodeon Nicktoons NOW 70s NOW 80s NOW 90s PBS America Phoenix CNE Channel HD Pick Premier Sports 1 Premier Sports 2 Quest Quest Red QVC Racing TV Really Rewind TV RTE News RTE Raidio na Gaeltachta Sanskar Sky Arts Sky Atlantic Sky Cinema Action Sky Cinema Action Heroes Sky Cinema Adventure Sky Cinema Animation Sky Cinema Apocalyptic Sky Cinema Award Season Sky Cinema Comedy Sky Cinema Drama Sky Cinema Family Sky Cinema Greats Sky Cinema Hits Sky Cinema Horror Sky Cinema Premiere Sky Cinema Sci-fi/Horror Sky Cinema Spooky Sky Cinema Thriller Sky Cinema Wizarding World Sky Comedy Sky Crime Sky Documentaries Sky History Sky History 2 Sky Kids Sky Max Sky Mix HD Sky Nature Sky News Sky One Sky Sci-Fi Sky Sports + Sky Sports Action Sky Sports Arena Sky Sports Box Office Sky Sports Cricket Sky Sports F1 Sky Sports Football Sky Sports Golf Sky Sports Main Event Sky Sports Mix Sky Sports News Sky Sports Premier League Sky Sports Racing Sky Sports Tennis Sky Witness Sony Entertainment TV Asia Sony MAX Sony MAX 2 Sony SAB Syfy Talking Pictures TV talkSPORT That's Melody That's TV TLC TNT Sports 1 TNT Sports 10 TNT Sports 2 TNT Sports 3 TNT Sports 4 TNT Sports 5 TNT Sports 6 TNT Sports 7 TNT Sports 8 TNT Sports 9 TNT Sports Box Office TNT Sports Box Office 2 TNT Sport//ESPN TNT Sports Ultimate Together TV Travelxp TRT World True Crime True Crime Xtra TVC News U&Alibi U&Dave U&Dave ja vu U&Drama U&Eden U&Gold U&W U&Yesterday Utsav Bharat Utsav Gold Utsav Plus Viaplay Sports 1 Viaplay Sports 2 WildEarth Yesterday Zee Cinema Zee TV

Nasa's Unexplained Files

Geologists begin to ask questions about 'alien' deposits found on the Earth's surface - and the answer could shed light on the cause of history's greatest extinction event

Today · Friday, 17 April 1 airing
13:00
Discovery History
S5 E6 · CIA's Secret Revenge
Monday, 20 April 2 airings
13:00
Discovery History
S5 E7 · The Moon's Strange Secret
23:00
Discovery Science
S4 E7 · Aliens in the Amazon
Tuesday, 21 April 1 airing
00:00
Discovery Science
Secrets of the Alien Signals