Blue Origin latest: Last-minute delay as Jeff Bezos's space firm set to launch NASA mission to Mars

Blue Origin has set a new lift-off time in roughly 30 minutes.

T-0 is now 8.45pm.

In a statement, Jeff Bezos's company says: "We are recycling and resetting the clock with a new T-0 of 3:45 PM EST/20:45 UTC."

We've just heard from Blue Origin.

Speaking on their livestream (you can watch along at the top of the page) they've just said the company is "investigating" the issue.

But they add: "We're expecting them to reset the clock."

It isn't clear when they expect this to happen.

Our science correspondent Thomas Moore has been following the launch, which was just aborted.

"We're waiting for more information on exactly why they have held the launch," he tells Paste BN lead UK news presenter Sarah-Jane Mee.

"The first attempt at launching this was on Sunday - that was cancelled because of bad weather and also a cruise ship that strayed into the safety zone. 

"And then yesterday, they had to cancel because of the solar storm. 

This time "it had been going so well", Moore says.

As the launch was again halted at T-20, this means "anxious moments", he adds.

He cautions, however, that "we shouldn't read too much into this" regarding what this says about the capabilities of Blue Origin.

"The key test for any rocket is getting up into orbit, and it did it the first time around." 

We're still waiting to hear from Blue Origin why its launch has been paused at the last moment.

With only 20 seconds left, Jeff Bezos's space company froze the countdown.

All we know so far is that it's investigating, but space fans down in Florida have been left watching and waiting, fingers crossed that it will still go ahead.

The Blue Origin team has put a hold in place at T-minus 20 seconds.

It means the countdown is frozen.

It isn't clear yet why that's happened, but in a short post on social media Blue Origin says: "Terminal count abort. The team is investigating."

We're now T-minus one minute until lift-off.

You can watch live in the stream at the top of the page.

Crowds have gathered in Florida ahead of the launch of Blue Origin's New Glenn rocket.

It's taking off from the Cape Canaveral Space Force Station.

Space fans have gathered for the third time since Sunday hoping to see it lift-off.

We're now less than three minutes from launch.

One key part of today's launch is Blue Origin testing whether it can safely land its New Glenn rocket booster.

It has achieved this with its much smaller models, but if it wants to consistently run science-scale missions for NASA this is an important step.

Similarly, for the company, being able to land and reuse boosters saves huge amounts of money.

SpaceX, Elon Musk's company, was first to nail this on large-scale rockets and has been using it to set up his Starlink network, regularly launching rockets up and landing them back down.

As our science correspondent Thomas Moore says in our 17.30 post, if Blue Origin can do this, it'll mark the company out as serious competition for Musk.

With 15 minutes to go until the launch window opens, you can watch live in the stream at the top of the page. 

Blue Origin is broadcasting the launch from Cape Canaveral Space Force Station and we've just heard it confirmed: the launch is definitely happening. 

Stay with us as we bring you all the latest.

Blue Origin doesn't advertise how much it charges to take people into space.

Its most high-profile flight to the edge of orbit took Katy Perry up - so you'd imagine being famous may help you get a seat.

But we do know how much other providers charge.

Virgin Galactic, Sir Richard Branson's space tourism company, charges $450,000 (£356,000) for a ticket for a 90-minute trip to space.

According to Virgin Galactic, it's a price people are willing to pay. "Demand is high", the company's website says, with several hundred customers already in line to fly.

Space Perspective, which will use a balloon to take people to the edge of space, charges $125,000 (£94,724) per seat.

According to reports, Axiom Space charges $28m (£21m) but takes tourists on a roughly two-week trip - instead of just going to the edge of space and back.