Monday, 23 May 2016
Science Correspondent - Sam Rolfe
Sam Rolfe our science correspondent joined us tonight.
Tsunamis on Mars
Mars currently relatively dry and cold surface, very difficult for liquid to exist at the surface, but approximately 3 billion years ago, it is thought Mars had a warmer, wetter climate – evidence of liquid flowing on the surface, e.g. channels and fluvial fans.
Mars is split into two approximate regions: the northern younger lowland plains and southern ancient highlands. The relatively flat lowlands thought to be due to an ocean, but a lack of a clear shoreline has created doubt about this theory. Satellite data has revealed a possible major redistribution of sediments at the edge of these two regions.
However, if the shorelines were regularly hit by tsunamis they would be disguised due to sediment build up an otherwise clear coastline. Once the water started to flow back towards the ocean, it cut new backwash channels, which have been identified by the study. Two sediment deposits have been identified, with areas of 800,000 sq km being covered by the older event and 1,000,000 sq km, due to waves of between 50 and 120 m high produced by impacts leaving craters 30 km wide. For comparison, Meteor or Barringer Crater in Arizona is just over a kilometre in diameter.
Wearable Technology Revolution – How many steps should you be doing?
We often hear that we need to hit 10,000 steps a day to be moving towards a healthy lifestyle. Where does this number come from and is it even correct?
In the 1960s, a pedometer was sold in Japan called manpo-kei, translated as 10,000 steps meter and that is where it has come from.
Given that the original 10,000 steps just happened to be how many steps the pedometer could count, it is not a very scientific number. Research says that healthy adults take about 4,000 to 18,000 steps per day and anyone who ups their steps from 1,000 to 10,000 decreases their risk of premature death by 46 %.
Scientist of the Month
She worked at the China Academy of Tradition Chinese Medicine, Beijing when awarded the Nobel Prize in Physiology or Medicine 2015 for discoveries concerning a novel therapy against Malaria.
What to see in the Night Sky
26th May 00:25 am 4 min Planets: Jupiter, Saturn, Mars
11:30 pm 6 min
27th May 10:38 pm 5 min
28th May 00:14 am 6 min
09:46 pm 4 min
11:21 pm 6 min
29th May 10:28 pm 6 min
30th May 00:05 am 6 min
11:12 pm 6 min