NASA will test its planetary defences by smashing a spacecraft into an asteroid later this month – and you can watch it live.
Live coverage of the Double Asteroid Redirection Test (DART) Mission’s final moments will be streamed around the globe.
How to watch DART live stream
Nasa has announced that it will broadcast live coverage of DART’s impact with the asteroid Dimorphos on Monday, September 26.
It all kicks off at 6 p.m. EST (11 p.m. BST), though the precise timing of the collision is unclear.
You can watch the show on Nasa’s website or on the space agency’s official YouTube channel.
Rather than a video feed of the impact, expect live commentary from Nasa experts on whether or not the mission was a success.
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Dimorphos will be about 6.8million miles (11 million km) from Earth at the time of DART’s impact – too far for a video broadcast.
Instead, a small cubesat deployed by DART ahead of impact will snap images before and after the collision.
It will then beam those images back to Earth, allowing scientists to assess whether the mission was a success.
Those images will likely take a few hours to reach mission control.
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DART mission explained
DART will dramatically smash into an asteroid 11million miles from Earth later this month.
The ambitious project – which involves teams from Nasa and the European Space Agency – is a test of technologies for preventing an impact of Earth by a killer asteroid.
Should it prove successful, it could pave the way for a new planetary defence system that can deflect incoming space rocks before impact.
The scheme mirrors the plot of the 1998 blockbuster flick “Armageddon” in which Nasa flies a spacecraft to an asteroid to stop it from hitting Earth.
“DART will be the first demonstration of the kinetic impactor technique to change the motion of an asteroid in space,” Nasa says on its website.
The DART spacecraft consists of a box-shaped body about twice the size of a washing machine flanked by two, 18-metre-long solar panels.
On November 24, 2021, it launched aboard a SpaceX Falcon 9 rocket from Vandenberg Air Force Base, California.
DART will reach the binary near-Earth asteroid Didymos around nine months later, in September – 11million miles from its home planet.
Didymos is about 740 metres across and sits between the orbits of Earth and Mars. It is not the mission’s primary focus.
Instead, Nasa’s intrepid battering ram will set its sights on a smaller asteroid – or moonlet – orbiting Didymos closely.
DART will smash into the space rock at 15,000mph in an attempt to change its orbital trajectory around its host.
After DART crashes into its target, Nasa and ESA will train telescopes on Earth on it to check whether the scheme has worked.
A tiny probe launched alongside the mission will collect data before, during and after the impact.
“The DART spacecraft will achieve the kinetic impact deflection by deliberately crashing itself into the moonlet at a speed of approximately 6.6 km/s, with the aid of an onboard camera (named DRACO) and sophisticated autonomous navigation software,” Nasa says.
“The collision will change the speed of the moonlet in its orbit around the main body by a fraction of one percent.
“This will change the orbital period of the moonlet by several minutes – enough to be observed and measured using telescopes on Earth.”
Space experts have already identified at least 26,000 so-called “near-Earth objects”.
An estimated 4,700 meet Nasa’s classification as “Potentially Hazardous Objects”.
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That means they are larger than 500ft across, pass within 4.7million miles of Earth and would cause devastating damage if they hit.
Didymos is not considered a threat to our planet, but DART promises to help Nasa and ESA build a system to defend Earth from any space rocks that may get a little too close for comfort in future.
Radar images of the near-Earth asteroid (65803) Didymos and its moonlet, taken on 23, 24 and 26 November 2003[/caption]
Nasa’s DART mission will smash into an as asteroid between Earth and Mars[/caption]
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