1) Io 22) Harpalyke 43. Arche
2)Europa 23) Kalyke 44. Kallichore
3) Ganymede 24) Iocaste 45. Helike
4) Callisto 25) Erinome 46. Carpo
5) Amalthea 26) Isonoe 47. Eukelade
6) Himalia 27) Praxidike 48.)Cyllene
7) Elara 28) Autonoe 49. Kore
8) Pasiphae 29)Thyone
9) Sinope 30) Hermippe
10) Lysithea 31) Aitne
11) Carme 32) Eurydome
12) Ananke 32) Eurydome
13) Leda 34) Euporie
14) Thebe 35) Orthosie
15) Adrastea 36) Sponde
16) Metis 37) Kale
17) Callirrhoe 38) Pasithee
18) Themisto 39) Hegemone
19.)Megaclite 40) Mneme
20) Taygete 41) Aoede
21) Chaldene 42) Thelxinoe
Io is the most volcanically active body in the solar system. Its surface is covered by sulfur in different colorful forms. As Io travels in its slightly elliptical orbit, Jupiter's immense gravity causes 'tides' in the solid surface 100 meters (300 feet) high on Io, generating enough heat to give rise to the volcanic activity and drive off any water. Io's volcanoes are driven by hot silicate magma. ___adrita
Hi, everyone. Weide here. Today, I shall present Hannah's favourite thingy.... the Crab Neb!!! XD hahahas. This has something to do with the weird pulsar pulsating in the supernova remnant. The article is courtesy of Fraser.
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In 1054, Chinese and Arab astronomers noticed a new star shining brilliantly in the sky. This was one of the first recorded observations of a supernova, and the remnants of that explosion are what we now call the Crab Nebula. The nebula still interests astronomers today, as in addition to its spectacular beauty, it's host to a pulsar with curious properties that may change drastically our understanding of the physics of pulsars.A team led by Dr. Jean Eileck and Tim Hankins at New Mexico Tech looked at the Crab pulsar in the radio spectrum using the Very Large Array and Aricebo telescopes, and discovered to their surprise that the pulsar's radio emissions are much more complex than previously thought.
Their article, What makes the Crab pulsar shine?, appeared in the proceedings of the meeting Forty Years of Pulsars: Millisecond Pulsars, Magnetars and More.
The Crab pulsar – a rapidly spinning neutron star that emits radiation from its magnetic poles like a lighthouse – actually emits two different pulses; one is called the main pulse, and the other, which is about 160 degrees away in rotation from the main one, is called the interpulse.
They looked at individual pulses over very short periods of time to tease apart their properties, and found that the interpulse differs in three significant ways from the main pulse on certain radio frequencies: it produces light that is more polarized - the wavelengths of light are more aligned together - the interpulse lasts longer, and the radiation emitted is more dispersed.
"Because similar physics should lead to similar emission processes, these models suggest that the main pulse and interpulse should be the same in their observable quantities. We were – and remain – quite surprised that this turns out not to be the case in the Crab pulsar," Eileck wrote.
In other words, it is curious that the interpulse should have different properties, given that it is thought to come from the same mechanism as the main pulse. This raises a lot of questions as to our knowledge of pulsar physics: Are other pulsars like this? How do pulsars create such different radio emissions?
"The Crab is clearly special as far as the number of components in its mean profile, and also the fact that it has a larger number of very-bright pulses than most pulsars (those "giant" pulses are the ones bright enough for us to study individually). But no one knows if that means its emission physics is special, or ordinary… there's still argument about that," Eileck wrote in an email response.
Eileck's team plans to look at other pulsars with the aim of answering this very question, among the host of others raised by their research.
hehe. Maybe we all can discuss about this article? I don't know but I hope this will be a precedent for the other BPST members to post astro articles here for all to enjoy and discuss. Thanks. =)
Oh. My. God.
WHAT HAPPENED TO THIS BLOG?!???!
*draws a pentacle, chat random words and raise it from the dead*
ok...
mineral here trying to save the blog
So today some of us were cleaning out the astro store.
And like wow. We found astro equipments that WE NEVER USED OR EVEN KNOW IT WAS THERE.
That includes 2 TELESCOPES.
And now we realise we have a total of 10 pairs of binoculars in total.
I think tomorrow we will find out whether the telescopes and binoculars are working..
I shall have my fingers crossed...
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