The article seems to be using the cost of Burj Khalifa without accounting for inflation. $1.5 billion in 2009 would be about $2.2 billion in 2024. NASA's proj

The article seems to be using the cost of Burj Khalifa without accounting for inflation. $1.5 billion in 2009 would be about $2.2 billion in 2024. NASA's project is still expensive, but not quite twice as expensive as Burj Khalifa (unless the budget overruns again).