Dark energy may be weakening, challenging our understanding of universe
Dark energy may be weakening, challenging our understanding of universe

Dark energy, the mysterious force thought to be driving the ever-faster expansion of the universe, appears to be changing over time, according to new observations released Wednesday. If dark energy is, in fact, weakening, it would likely mean that sciences understanding of how the universe works...

Dark oxygen: A deep-sea discovery that has split scientists
Dark oxygen: A deep-sea discovery that has split scientists

Could lumpy metallic rocks in the deepest, darkest reaches of the ocean be making oxygen in the absence of sunlight? Some scientists think so, but others have challenged the claim that so-called dark oxygen is being produced in the lightless abyss of the seabed. The discovery -- detailed last...