Physics, Archimedes’ Principle, helium balloons, and air as a liquid – Dr. Paul Heckert answers a reader question in this new Ask the Expert article.
About Paul A. Heckert, Ph.D.
How Astronomers Know the Universe Is Expanding
It’s time for another ‘Ask the Expert’ question from our readers. This reader wants to know how we really know the universe is expanding – Paul Heckert, PhD has the answer.
What Are Plasma Density Ducts, and How Did Science Discover Them?
Since the middle of the 20th century, scientists have thought that the plasmasphere contains plasma ducts following Earth’s magnetic field lines. S.T. Loi recently confirmed the presence of these plasma density ducts in Earth’s upper atmosphere.
Journey Work of the Stars: Origin of the Chemical Elements
If the Big Bang didn’t create the heavier elements, where did they come from? Stars are the source of elements beyond hydrogen and helium – including the ones in us.
Kepler-186f: How Astronomers Discovered an Earth-Sized Planet in a Star’s Habitable Zone
How did astronomers find Kepler-186f, an Earth-sized planet in the fabled ‘habitable zone’ – where liquid water can exist?
Comet ISON: A Legend in the Making?
Comet ISON is hot news among amateur astronomers, with thousands of people tuning in with their telescopes world-wide to capture the ‘Comet of the Century.’ Is ISON really so impressive?
What’s Around the Sun? Is Our Sun in a Vacuum?
Astronomy questions and answers: Although space is not a perfect vacuum, it surrounds the sun and other stars, unaffected by heat or other factors.
