Edward Joseph Snowden started to get the international attention in early June 2013 after revealing thousands of NSA documents to journalists. His stories about this appeared in The Guardian and The Washington Post. When it came to U.S Department of Justice, they charged him for two violations on Jun 21, 2013: the espionage act and theft of government property. In summer 2013, reportedly got the temporary asylum for three years from the Russian authorities.

Can you hear me now?

— Edward Snowden (@Snowden) September 29, 2015

Only a few minutes after his first tweet, Neil DeGrasse Tyson, an astrophysicist welcomed him. This is what he responded to Neil on his Twitter:

.@neiltyson Thanks for the welcome. And now we've got water on Mars! Do you think they check passports at the border? Asking for a friend.

— Edward Snowden (@Snowden) September 29, 2015

And the conversation continued.

Ed @Snowden, If you visit Mars, I'd bet any life forms there will greet you with a sip of that water — and a tourist visa.

— Neil deGrasse Tyson (@neiltyson) September 29, 2015

And, Ed @Snowden, glad to see the long exile hasn't affected your sense of humor. Staying busy?

— Neil deGrasse Tyson (@neiltyson) September 29, 2015

.@neiltyson Surveillance never sleeps, and secret projects @FreedomofPress are keeping me busy, but I still find time for cat pictures.

— Edward Snowden (@Snowden) September 29, 2015

Some people call Snowden a hero, a whistleblower, a dissident, and a traitor. How he responded to these labels?

.@neiltyson, @DanielEllsberg told me #labels never stopped progress. Neither in 1776 nor today. pic.twitter.com/CzRZ6ur6xc

— Edward Snowden (@Snowden) September 29, 2015

Ed @Snowden, after discussing everything from Chemistry to the Constitution on #StarTalk, you're a patriot to me. Stay safe.

— Neil deGrasse Tyson (@neiltyson) September 29, 2015