SpaceX's next big rocket, the Falcon Heavy.

This vehicle can create more than five million pounds

of thrust at liftoff, and is capable of putting

around 140,000 pounds into lower Earth orbit.

That's more than twice the weight that any other rocket

currently on the market can carry.

So right now, the Falcon Heavy holds the title

for the most powerful rocket in the world.

- I'm very excited about this launch because

I think this is gonna really show

that we can do giant rockets again.

Most space organizations, government or commercial,

have set their sights too low.

They've really built relatively small rockets.

And Falcon Heavy is the first time

that there's something that's arguably

even in the super heavy class or somewhere between

heavy and super heavy:

showing that you can launch a giant rocket

and have it be commercially viable,

carry satellites, potentially carry people.

Falcon Heavy is capable of actually taking

a dragon mission of taking people around the moon.

- Is there any update on that, by the way?

- Not yet. - Not yet.

- We're sort of debating whether to do that

on Falcon Heavy or BFR (big f***ing rocket) , it will all sort of depend on

how well the BFR development's going, as to

whether we focus on BFR for deep space human flight

or whether we do that on Falcon Heavy.

- What do you see has been the biggest challenge

for making this rocket fly?

- The biggest challenge of getting to the launch pad

has been that we had to completely redesign the center core.

The load going through the center core is

much greater than would normally go through

a Falcon 9 rocket.

Each of the side boosters is putting in

half a million pounds of thrust into the center core.

So you have an incremental million pounds of force

going through that center core,

which means we had to really redesign

almost the entire stage.

All the way through the inner stage

had to be redesigned to strengthen it.

- Okay, well I have one more question,

but I want to know what you're most excited about

when you've launched this rocket by tomorrow.

- I'll be really proud of the SpaceX team

for having accomplished this incredible task.

And hopefully we inspire the public

to get excited about space again.

But it's not just the public

getting excited about the Falcon Heavy.

Some customers, like the Planetary Society,

are planning on using Falcon Heavy for their next flights,

hoping that a successful test launch

will spell success for their missions as well.

- We are tied to SpaceX.

We wish us the best today.

SpaceX is really visionary, but it really is

a fantastic idea.

Rockets should be like airplanes

where you don't throw them away,

you use them and then reuse them.

So it's visionary.

- Now if everything goes well today,

how will it feel to see that Falcon Heavy soar?

- Oh it'll be great.

So, we flew the first LightSail almost two years ago,

and it's a thrill.

We're very excited about it.

The idea is to democratize space,

to lower the cost of getting to many destinations

in our solar system.

The reason you do this everybody,

the reason the Society does this,

there are two questions, Loren, that we have all asked:

Where did we come from?

How'd we all get here, where did we come from?

And are we alone in the universe?

And if you want to answer those two questions,

you have to explore space.

We're finally here at NASA's press site.

After all of the hype,

after so many years of waiting, and it is intense.

I've been to a couple of launches here before,

but I've never seen it this packed.

Just getting in here today, there was a huge traffic jam.

And the vibe here?

Everybody is super anxious.

We're really ready to see this thing get off the ground.

Originally the launch was set for 1:30 p.m. Eastern.

Then it got pushed back to two.

Then 2:20, then 2:50.

It turned out upper level winds in the area

were too high for flight,

and SpaceX was trying to wait for them to die down.

People started worrying that they'd have to

come back the next day.

So we've all been on edge today,

SpaceX kept pushing the launch time

back, and back, and back.

Now we have a new T-minus zero which is 3:45 p.m.,

but our launch window only lasts until four p.m.

However, the rocket is loaded with propellant,

so I think it might actually go up today.

- The center core locks look complete.

- Tropic lower has ended,

Strombeck's at 88.2 degrees.

- Falcon Heavy gas loads are complete

and Heavy is configured for flight.

- T-minus 15, stand by for general count.

- Launch to red code.

- Ten, nine, eight.

- Side base to ignition.

- Six, five, four, three,

two, one, zero, ignition.

- Oh my god.

- Ooh, it's hitting us.

Wow, that is a beast.

Oh my god, you feel it.

We can still see it clear as day.

It's supersonic, b*tches.

Oh my god.

I'm gonna go.

- I'm gonna keep rolling.

- Hold on Loren, we're gonna go together.

- Side boosters begin.

The center.

Side boosters' landing legs are deployed.

- And the Falcon has landed.

- We're gonna hear six sonic booms.

Oh my god.

Oh, man.