He tweeted last week after the landing: "WowW Just wonderful from @NASAPersevere!" The chorus of congratulatory messages was also joined by astrophysicist Neil deGrasse Tyson, who said: "Congratulations to @NASA on the successful landing of the SUV-Sized Perseverance Rover on planet Mars." But not everyone shared in the jubilations as a minor community of sceptics and conspiracy theorists challenged the Mars landing. Mars rover photos: A UFO hunter has acused NASA of altering its Perseverance photos (Image: NASA) Mars rover photos: The first photo Perseverance beamed back to Earth from the planet's surface (Image: NASA) READ MORE Some social media users questioned the Mars rover's £2.05billion ($2.9billion) price tag while others bizarrely claimed the landing was an elaborate hoax.