News An aerial picture of the Grand Canyon in Arizona from around 30,000 feet (10,000m)

It was thought that the global landmark was perhaps 70million years old

Science: Technoquest Interplantary debris/ Crocodile armour/ Volcanoes/ Hiccups

Questions for this column may be submitted by e-mail to sci.net@campus.bt.com

Where I'll be in 2028, when asteroid XF11 hits our planet

There are so many ways to prepare to meet our doom, but one scares me more than all the others ...

That was close: Earth dodges death by just 600,000 miles...

For a few hours yesterday it looked as thought that 30-year mortgage might not have been such a smart buy after all, writes Charles Arthur, Science Editor. It was announced that an asteroid a mile wide was whirling towards the Earth, and there was a real chance that unless we took some avoiding action, it would hit us and wipe out civilisation.

Science: A home from home

Nasa wants to establish a Moon base. But what would it be like to live there?

Cook sees Montserrat's agony for himself

Defying volcanic ash clouds that forced his staff to don surgical- style nose masks, the Foreign Secretary, Robin Cook, toured the Caribbean island of Montserrat on Saturday to see the plight of its residents.

Science: Big days on little planets: visitors from Earth call in

David Whitehouse on voyages to asteroids, the Solar System's fossils

Letter: Unseen asteroids

Unseen asteroids

Science: Asteroids' tidal wave threat

The impact of a wayward asteroid on one of the earth's oceans would spell disaster for coastal cities, a US scientist says. Such an impact would trigger massive tidal waves, or "tsunamis" capable of travelling thousands of kilometres and devastating entire coastlines - though Britain, it seems, would be spared the worst effects.

Letter: Cold meteorites

Sir: Charles Arthur ("Search for Greenland's thunderbolt", 16 December) perpetuates a popular misconception when he states that "On landing [a meteorite] would be incredibly hot, and melt its way through the icecap". Meteorites are cold when they land. Hence they preserve a record of their history in space.

Radar hunt for meteorite

Danish aircrews are planning to search for the meteorite which fell last week on the southern tip of Greenland by using ground-penetrating radar. New estimates suggest that the meteorite, which streaked across the dawn sky on 9 December, could weigh 50 tonnes or more.

Search for Greenland's thunderbolt

A dense meteorite crashed into the southern tip of Greenland last week. The hunt for it goes on, but it would take someone with Miss Smilla's feeling for snow to find it. This, however, is real life. Charles Arthur, Science Editor, investigates another narrow escape.

Letter: Space invaders

Sir: The threat to Earth from a devastating asteroid impact has somehow been both overestimated and underestimated in Charles Arthur's article about the Chicxulub crater ("Asteroid that killed dinosaurs will strike again - in 35 million years", 4 December).

Science: Asteroid that killed dinosaurs will strike again - in 35 million years

The asteroid impact that wiped out the dinosaurs 65 million years ago was caused by a comparatively small meteor of the size which could be expected to hit the Earth once every hundred million years, according to British scientists.

Books: Derail this stage-struck express

Michael Arditti argues that it's time to bring down the curtain on the cult of Stephen Daldry

Boxing: Oliver is back for more

Spencer Oliver hopes to go one better than Naseem Hamed and stop Italy's Vincenzo Belcastro when they meet for the Londoner's European super-bantamweight title at Alexandra Palace tonight. Belcastro, now 36, lost the European bantamweight title to Hamed in Sheffield in May 1994, surviving two knockdowns but still losing by a landslide.
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Day In a Page

Burgundy, the River Rhone & Provence – MS Swiss Corona - seven nights from £999pp
Lake Maggiore, Orta and the Matterhorn – seven nights from £899pp
Sicily – seven nights from £939pp
Pompeii, Capri and the Bay of Naples - seven nights from £799pp
Istanbul Ephesus & Troy – six nights from £859pp
Mary Rose – two nights from £319pp
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