What is the upper limit for massive stars?
Yesterday I mentioned that hypernovae (super-supernovae) are the result of the explosion of a star that's about as massive as a star can be (about 150-200 solar masses). But how exactly do we know that t ...
How do we terraform Venus?
It might be possible to terraform Venus some day, when our technology gets good enough. The challenges for Venus are totally different than for Mars. How will we need to fix Venus?
New study confirms water vapor as global warming amplifier
A new study from scientists at the University of Miami Rosenstiel School of Marine and Atmospheric Science and colleagues confirms rising levels of water vapor in the upper troposphere – a key amplifier ...
Warming Earth heading for hottest year on record (Update)
Earth is on pace to tie or even break the mark for the hottest year on record, U.S. meteorologists say.
Mysterious source of ozone-depleting chemical baffles NASA
A chemical used in dry cleaning and fire extinguishers may have been phased out in recent years but NASA said Wednesday that carbon tetrachloride (CCl4) is still being spewed into the atmosphere from an unknown ...
New study suggests more and longer atmospheric stagnation events due to global warming
Venus Express gets ready to take the plunge
(Phys.org) —After eight years in orbit, ESA's Venus Express has completed routine science observations and is preparing for a daring plunge into the planet's hostile atmosphere.
World breaks monthly heat record two times in a row (Update)
The globe is on a hot streak, setting a heat record in June. That's after the world broke a record in May.
Organic molecules in Titan's atmosphere are intriguingly skewed
(Phys.org) —While studying the atmosphere on Saturn's moon Titan, scientists discovered intriguing zones of organic molecules unexpectedly shifted away from its north and south poles. These misaligned features ...
What geology has to say about global warming
Last month I gave a public lecture entitled, "When Maine was California," to an audience in a small town in Maine. It drew parallels between California, today, and Maine, 400 million years ago, when similar ...
Researchers discover new clues to determining the solar cycle
Approximately every 11 years, the sun undergoes a complete personality change from quiet and calm to violently active. The height of the sun's activity, known as solar maximum, is a time of numerous sunspots, ...
Transforming hydrogen into liquid fuel using atmospheric CO2
Swiss scientists have completed their solution for transforming hydrogen gas into a less flammable liquid fuel that can be safely stored and transported. Another possible application of their technology would ...
'Time running out' as CO2 levels hit new high, UN says
Atmospheric carbon dioxide concentrations have crossed a new threshold, the UN's weather agency said Monday, highlighting the urgency of curbing manmade, climate-altering greenhouse gases.
How Earth avoided global warming, last time around
Geochemists have calculated a huge rise in atmospheric CO2 was only avoided by the formation of a vast mountain range in the middle of the ancient supercontinent, Pangea. This work is being presented to the ...