Explainer

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Breaking down the colours in the star light can reveal more about what you are looking at. Flickr/Indigo Skies Photography

Explainer: seeing the universe through spectroscopic eyes

Astronomers can tell a whole lot more about a star or a galaxy if they break up the visible light in a rainbow of colours.
The government’s bill introduces three means for revoking a dual national’s Australian citizenship under amendments to the Australian Citizenship Act. AAP/Mick Tsikas

Who exactly makes the call on conduct that revokes citizenship? New bill doesn’t say

Should the bill be enacted in its current form, Australian citizenship will be able to be stripped from dual nationals by bureaucratic determination for conduct that is defined with reference to the criminal law.
Under certain conditions, war may be morally permissible, or even necessary. EPA/Said Yusuf Warsame

How should we think about war? Understanding Just War Theory

Political leaders frequently invoke Just War Theory to ground their explanations of why they are waging war against another state and how they plan to do so. What are the key components of this moral position?
Debate over potential pollutants calls for better tools to measure air quality. Singapore Spotter/flickr

Explainer: is aircraft cabin air toxic?

Health effects from contamination on planes is controversial, not least because we don't measure on-board air quality during 'fume events'.
Immigration Minister Peter Dutton will have the sole power to strip dual nationals of their Australia citizenship if they are believed to be involved in terrorist activities. AAP/Dave Hunt

Explainer: what is ‘judicial review’? How does it apply to citizenship?

Simply having judicial review for the contentious power to strip citizenship from dual nationals suspected of involvement with terrorism – without independent merits review – is far from reasonable.
Bill Shorten has introduced a bill into parliament to amend the Marriage Act and allow same-sex marriage in Australia. AAP/Mick Tsikas

Explainer: how Australia can legalise same-sex marriage

The legislative reform required to allow same-sex marriage is not complicated. There is relative consensus as to how this can be achieved.
A man undergoes “xenodiagnosis” for Chagas disease in the Argentine province of Corrientes. In this procedure, uninfected triatomine bugs feed on the blood of patients. Later examination of these insects may reveal parasites acquired from infected blood. German Pomar/Reuters

Explainer: what is Chagas disease?

This parasitic infection is endemic in Central and South America, and can lead to serious health complications. Though rare in the US, incidence is starting to increase.
How do we think about something we can’t see and don’t experience in our everyday lives, but seems to be pushing our universe apart ever faster? NASA, ESA, G. Illingworth, D. Magee, and P. Oesch (University of California, Santa Cruz), R. Bouwens (Leiden University), and the HUDF09 Team

Explainer: the mysterious dark energy that speeds the universe’s rate of expansion

Einstein's theory of gravity says dark energy must be out there, accelerating the expansion of our universe. But what is it and how can we try to figure out more about it?
The process of therapy is challenging and takes courage. Photographee.eu/Shutterstock

Explainer: what is cognitive behaviour therapy?

If you or someone you care about experience an emotional problem it won't be long before you hear that cognitive behaviour therapy, or CBT, is probably the treatment of choice.

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