Impact

Season 4Episode 430 minjanv. 27, 2004
Impact
This week's programme is all about meteorites and asteroids. Not too far from the Rough Science base on the edge of Death Valley is Meteor Crater. Iain, Kathy and Mike have to work out how big the meteor that caused this huge crater must have been. But it's not just the Earth that gets hit by objects from outer space - the moon is also a target, as evidenced by its heavily cratered surface. So Jonathan and Ellen have to pick a crater on the moon - any crater will do - and measure how big it is. And because they'll be doing their measurements at night, Ellen has to come up with some lights. The Meteor Crater team decide they have to split their work. Kathy and Iain head off to the crater itself to try and measure its diameter. This is the first essential step if they are to work out how big the meteor was that caused the crater. At the same time, they are hoping to find out more about the meteor in the hope this will give them clues about its size. Meanwhile Mike stays behind to try and make his own crater. He performs a series of impact experiments, dropping heavy objects into sand in an effort to work out the relationship between the size of an object and the size of crater it forms. Jonathan and Ellen have been given a high quality optical mirror, and so to find and measure a crater on the moon, they build a reflecting telescope. Their plan is to time how long it takes the whole moon to travel across a fixed point in their eyepiece, and then time how long it takes their chosen crater to travel across that same fixed point. Because they know that the moon is 3500 kilometres across, they can use this as a starting point to calculate the diameter of the crater. For her lights Ellen heads to the hills and collects pine sap. She melts it to remove some of the most volatile compounds, and then uses bark fibres as wicks, to make highly effective Rough Science candles.
Impact has aired on janv. 27, 2004
Previous EpisodeNext Episode

Trailer

We do not have any trailers for this episode

Recently Updated Shows

Recently updated shows that might be of your interest.
The Red King
Running

The Red King

Smart, capable and by the book Grace Narayan was flying high as an inner-city police sergeant before being forced into a 'punishment posting' on the small, antiquated island of St. Jory. Confronted by the forgotten and unsolved case of missing teenage boy Cai, Grace quickly discovers that she must overcome scarce evidence, extraordinary local characters, and the island's strange cult history to uncover the truth. The Red King is a character-driven mystery-thriller, that combines the powerful story of a knotty police investigation with chilling, atmospheric folk-horror through the island's eerie past devotion to a pagan God called the Red King and the cult of the True Way.

GenreCrime, Thriller, Mystery
Alone Australia
Running

Alone Australia

Follow ten brave Australians who are dropped in the merciless Tasmanian wilderness, completely isolated from the world and each other, stripped of modern possessions, contact and comforts, to self-document their experience. Who will survive the longest?

GenreAdventure, Nature
Family Guy
Running

Family Guy

Family Guy follows Peter Griffin the endearingly ignorant dad, and his hilariously offbeat family of middle-class New Englanders in Quahog, RI. Lois is Peter's wife, a stay-at-home mom with no patience for her family's antics. Then there are their kids: 18-year-old Meg is an outcast at school and the Griffin family punching bag; 13-year-old Chris is a socially awkward teen who doesn't have a clue about the opposite sex; and one-year-old Stewie is a diabolically clever baby whose burgeoning sexuality is very much a work in progress. Rounding out the Griffin household is Brian the family dog and a ladies' man who is one step away from AA.

GenreComedy, Family
Evil Lives Here: The Killer Speaks
Running

Evil Lives Here: The Killer Speaks

Take a chilling look inside the homes of actual killers and meet their families. Also, get a peek at their prisons to hear from killers themselves, resulting in powerful, unsettling and contentious encounters.

GenreCrime
90 Day Fiancé: Happily Ever After?
Running

90 Day Fiancé: Happily Ever After?

90 Day Fiancé: Happily Ever After? catches up with some of the most memorable couples from 90 Day Fiancé as they now face the next chapter in their marriages. The frenzied countdown to the altar may be behind them, but the true drama is just starting to unfold as these newlyweds face life's challenges with someone they barely know.

GenreDrama, Romance