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| Zoom Astronomy Questions and Answers (September 2001) | |
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Please check the Astronomy Dictionary first!
We enjoy hearing from visitors. Thank you for writing! You can send us your astronomy question and we'll try to answer as soon as possible (but we can't answer all the questions we receive).
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| Zoom Astronomy Questions |
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| Current Questions | November 2001 | October 2001 | September 2001 | August 2001 | June-July 2001 | May 2001 | April 2001 | March 2001 |
A: The biggest stars are red giant that are near the end of their life. Measuring the exact diameter of stars is very difficult, but Betelgeuse (in Orion) is one of the biggest known.
A: The force of gravity on Neptune is similar to gravity on Earth. The gravity on Neptune is only 1.19 times of the gravity on Earth. This is because this massive planet (Neptune's mass is about 1.02 x 1026 kg.) is also very large - the gravitational force a planet exerts upon an object at the planet's surface is proportional to its mass and to the inverse of its radius squared.
A 100-pound person would weigh 119 pounds on Neptune.
A: We see sunlight reflected off the moon. The sun lights up (one half of) the moon, and that's what we see.
A: The different layers of the Sun are at different temperatures. For a page on these temperatures, click here.
A solar eclipse happens when the moon blocks our view of the Sun; a lunar eclipse happens when the shadow of the Earth blocks the sunlight falling on the moon, so we cannot see the moon.
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No one knows why Pluto has such an odd orbit. Pluto may be a captured asteroid (if this is so, there is no reason for it to have an orbit similar to the other planets).
A: The surface soil on Mars contains a lot of iron, which appears reddish (think of rust, iron oxide, which is a red-orange color).
A: Nemesis is a hypothetical companion dark star to our Sun. Once every 30 million years, this dark star would pass through the Oort cloud, triggering comets that perhaps cause periodic mass extinctions on Earth.
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These telescopes example different spects of stars (and other celestial objects).Radio telescopes give information about the radio waves emitted by the object and X-ray telescopes give information about the X-rays emitted by the object. Visual telescopes give information about the waves of the electromagnetic spectrum in the visual range that are emitted by the object (i.e., what the object looks like).
| Zoom Astronomy Questions |
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| Current Questions | November 2001 | October 2001 | September 2001 | August 2001 | June-July 2001 | May 2001 | April 2001 | March 2001 |
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