Ask An Astronomer Answer Archives
- Why aren't the tides a perfect ellipsoid pointing directly at the Moon?
- What is the speed of light? Does time stand still for an observer traveling at the speed of light?
- What determines the Earth's orbit? What makes the Earth's interior hot?
- Is it true that an egg can only be stood on end on the date of the equinox?
- Re: standing eggs on end: more info please!
- When something reaches absolute Zero, do all of its molecules stop moving?
- Does the amount that a gravitational lens bends light depend on wavelength? Also, how do we know that redshifted objects aren't just intrinsically red objects?
- Will a satellite located at one of the "Lagrange points" stay there forever?
- How long does it take for a photon to travel from the center of the sun to the surface of the sun?
- How do I calculate the average orbital velocity of the moon?
- Why doesn't the Earth's gravitational field warp sunlight?
- If the Sun's gravitational pull on the Moon is greater than the Earth's, why does the Moon go around the Earth? Why is the Moon tidally locked to the Earth, but not to the Sun?
- A followup question to the one above: If tides are caused by gravity, why is there a difference between the strength of gravity and the ability to raise tides?
- Where can a satellite orbit the sun at the same rate as the Earth does?
- Does bath water spiral in different directions north and south of the equator?
- Do photons have mass?
- How does gravity look between two objects? Can gravity cause the observed red shifts of distant galaxies?
- What does "E eqals m c squared" mean?
- Is the net charge of the Universe neutral?