Hidden stars, baby planets and blowup spaceships
Tuesday 5 April 2016
Analysis for The Conversation by Dr Alan Duffy, Centre for Astrophysics and Supercomputing, Swinburne University of Technology.
Each fortnight I get the amazing opportunity to speak about my top stories in space on ABC Breakfast News TV but for those of you who hate early mornings I wanted to make sure you got to hear of these awesome events too.
Peering into the heart of our galaxy
How did we miss this many stars in our own backyard?
Well for starters, the centre of our galaxy is a busy place, with a million stars crowded into the region between our Sun and our nearest neighbour Alpha Centauri. It’s hard to conceive of just how bright the “night sky” would be for any aliens in the galactic core.
To make things even more confusing there exists a supermassive blackhole that can blind telescopes, although this is currently dormant it may yet fire into life by accreting nearby gas and stars.
The main reason is that there are giant clouds of gas and dust around the stars that can block their light. It’s similar to how your visibility decreases when driving a car in fog. Yet in that same car you can still listen to the radio, which is a different wavelength of light and able to easily pass through the fog. Rather than using optical wavelength the Hubble Space Telescope used another type of light with its infrared camera to peer through this gas and dust and see the hidden stars behind.
Even Hubble has limits though and there are likely another 10 million stars yet to be discovered.
ALMA spots baby planets growing
The gaps in this disc around a young star just 10 millions years old are caused by planets growing through gravitationally “hoovering up” the material along their orbit then shepherding the edges clean.
Even at a distance of 175 lightyears the incredible resolution of ALMA means we can actually see a gap around the star TW Hydrae at a similar distance that Earth is from our Sun. This makes for the exciting possibility that this baby planet will one day grow into an Earth (or perhaps continue to increase in size to a super-Earth).
This is like being shown an ultra-sound of our own Solar System’s earliest days and will likely be the best resolved image we have for years to come.
Forget the beach-house, get a blowup space habitat
This is an inflatable habitat that will be connected to the space station and then carefully expanded, increasing in volume from 3 to 16 cubic metres. This will be the first inflatable structure ever tested on the ISS and will be a carefully managed experiment.
Only when all safety checks are completed will astronauts from the station travel into the BEAM to install sensors before resealing it. After that, all this extra room on a craft where space is a prized asset, will be left unused except for periodic checks over the next two years.
Big challenges are ahead though as it has to survive getting punctures from fast moving space debris as well as showing it can provide protection from the dangerous radiation of space too. As Bigelow is a private company and created BEAM with properietary materials we don’t know exactly how it will hold up. However, it appears to be built with a material similar to the Vectran used in astronaut’s spacesuits so there’s no reason to think it won’t last.
This is a huge week in space and well worth an early Monday morning start.