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.
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.
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.
How did astronomers find Kepler-186f, an Earth-sized planet in the fabled ‘habitable zone’ – where liquid water can exist?
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?
Astronomy questions and answers: Although space is not a perfect vacuum, it surrounds the sun and other stars, unaffected by heat or other factors.
The universe is expanding. Light from distant galaxies travels toward us even as the galaxies travel away from us; making light’s total travel time longer.