Science I understand that new stars form out of mostly hydrogen with smaller amounts of heavier elements. If helium, carbon, oxygen, and other heavier elements were abundant enough to form stars, could they?
Science Why are most impact craters nearly perfectly round? I’d expect the impacts to result from an obtuse or glancing blow that would leave an oblong or ellliptical shape.
Science Why do the gas giant planets have so much gravity when they do not have solid cores like the terrestrial planets? Or do they have solid cores?
