Heads up: Top comment and controversy

How to defend against asteroids and meteors

Typically the preserve of science-fiction, now top of the news agenda, the prospect of an asteroid striking earth is raising alarm. This morning a meteor streaked across the sky in Russia, causing explosions and injuring 400 people. Later today a 150-ft asteroid will shave past earth at 17,000 miles distance, the closest recorded. If it hit, it could flatten London. So what defences do we have?

Meteors and asteroids have crashed into earth and will do so again. In 1908, one flattened 800 miles of Siberian tundra. Astronomers predict an asteroid spotted in 2004, known as Apophis, will crash in to the earth in 2036.

Even if Apophis misses, Wired report that "it's just a matter of time" before a rock lands plum on planet earth.

The Defence

1. The "nuclear option"

Route one. Armageddon posited the idea of blowing asteroids out of the sky in 1998. This could work outside a Hollywood studio, but wouldn't stop asteroid bit-lets causing havoc.

2. Gravity tractor

A creative solution. Space missiles can have their courses diverted by change in gravitational pull. Apparently, a single space-craft hovering above an asteroid could affect the trajectory enough to yank it away from bulls-eye.

3. A mirror

Perhaps the kind of brainwave only REALLY vain scientists would suggest (think Zoolander in a lab-coat), but an extremely large mirror could be used to focus energy on the asteroid and "boil off" parts of it

4. Phone Will Smith

He's saved humanity enough times already. And at the very least our species could be blasted off the face of the earth to the soundtrack of 'Miami'.

React Now

Read Next
Tulisa Contostavlos arrives to face drug charges at Southwark Crown Court on July 14, 2014  

Tulisa might have been attacked for being working class, but she still has to take some responsibility

Chloe Hamilton
Is Ed Miliband a natural born leader? Or could he become one?  

Wanted: a leader with the strength to withstand criticism from the media

Steve Richards
A new Russian revolution: Cracks start to appear in Putin’s Kremlin power bloc

A new Russian revolution

Cracks start to appear in Putin’s Kremlin power bloc
Eugene de Kock: Apartheid’s sadistic killer that his country cannot forgive

Apartheid’s sadistic killer that his country cannot forgive

The debate rages in South Africa over whether Eugene de Kock should ever be released from jail
Standing my ground: If sitting is bad for your health, what happens when you stay on your feet for a whole month?

Standing my ground

If sitting is bad for your health, what happens when you stay on your feet for a whole month?
Commonwealth Games 2014: Dai Greene prays for chance to rebuild after injury agony

Greene prays for chance to rebuild after injury agony

Welsh hurdler was World, European and Commonwealth champion, but then the injuries crept in
Israel-Gaza conflict: Secret report helps Israelis to hide facts

Patrick Cockburn: Secret report helps Israel to hide facts

The slickness of Israel's spokesmen is rooted in directions set down by pollster Frank Luntz
The man who dared to go on holiday

The man who dared to go on holiday

New York's mayor has taken a vacation - in a nation that has still to enforce paid leave, it caused quite a stir, reports Rupert Cornwell
Best comedians: How the professionals go about their funny business, from Sarah Millican to Marcus Brigstocke

Best comedians: How the professionals go about their funny business

For all those wanting to know how stand-ups keep standing, here are some of the best moments
The Guest List 2014: Forget the Man Booker longlist, Literary Editor Katy Guest offers her alternative picks

The Guest List 2014

Forget the Man Booker longlist, Literary Editor Katy Guest offers her alternative picks
Jokes on Hollywood: 'With comedy film audiences shrinking, it’s time to move on'

Jokes on Hollywood

With comedy film audiences shrinking, it’s time to move on
It's the best of British art... but not all is on display

It's the best of British art... but not all is on display

Voted for by the British public, the artworks on Art Everywhere posters may be the only place where they can be seen
Critic claims 'I was the inspiration for Blanche DuBois'

Critic claims 'I was the inspiration for Blanche DuBois'

Blanche Marvin reveals how Tennessee Williams used her name and an off-the-cuff remark to create an iconic character
Sometimes it's hard to be a literary novelist

Sometimes it's hard to be a literary novelist

Websites offering your ebooks for nothing is only the latest disrespect the modern writer is subjected to, says DJ Taylor
Edinburgh Fringe 2014: The comedy highlights, from Bridget Christie to Jack Dee

Edinburgh Fringe 2014

The comedy highlights, from Bridget Christie to Jack Dee
Dame Jenny Abramsky: 'We have to rethink. If not, museums and parks will close'

Dame Jenny Abramsky: 'We have to rethink. If not, museums and parks will close'

The woman stepping down as chair of the Heritage Lottery Fund is worried