1) What causes Saturn to be a bit squashed at its poles while fatter at the equa
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Question
1) What causes Saturn to be a bit squashed at its poles while fatter at the equator? A)The planet spins very fast B)Saturn is affected by tides from moons C)Saturn is in a fast orbit around the Sun D) Gravity is squashing the planet
2)What aspect of the orbit of Neptunes largest moon, Triton, iddicates it was probably a captured object that did not orgionally orbit around Neptune. A) Orbits around Neptune backwards B) it is tipped on its side C) It is upside-down D)Its suprisingly close to Neptune E)it spins the wrong way on its axis F) its orbit around NEptune is elliptical
3)A lot of exoplanets are found orbiting other stars by watching the Doppler shift of lines in a star’s spectrum. From looking at the timing and strengths of the shifts, astronomers can fairly directly determine two properties of the planet: One is the orbital period. The other is what? A) Age of a planet B) planets diameter C) Planets compositon D) Planets mass
4) Pick the one true Statments about reflecting telescopes A)It suffers from "spherical aberration" when not shaped perfectly B)It is the type of telescope that Galileo first used C) it uses mirrors to focus light D) This kind of telescope is no longer used today by professional astronomers
5)True or false. The three major functions of a telescope are magnification, making objects brighter, and improving resolution? A) True B) False
6) What problem does "adaptive optics" overcome? A) THe problem of low light gathering power B) Blurring caused by the earths atmosphere C) the problem of chromatic aberration D) Difficulties achieving high magnification
Explanation / Answer
1. What causes Saturn to be a bit squashed at its poles while fatter at the equator? -
Saturn spins very fast, causing the centrifugal forces to develop a bulge at the Equator.
2. What aspect of the orbit of Neptunes largest moon, Triton, indicates it was probably a captured object that did not orgionally orbit around Neptune?
Orbits around Neptune backwards
Triton has a retrograde orbit about its planet (it orbits in a direction opposite to the planet's rotation). Most of the outer irregular moons of Jupiter and Saturn also have a retrograde orbits, but they are much more distant from their primaries and are small in comparison (8% of the diameter of Triton).
Triton's revolution around Neptune has become a nearly perfect circle with an eccentricity of almost zero.
3. A lot of exoplanets are found orbiting other stars by watching the Doppler shift of lines in a star’s spectrum. From looking at the timing and strengths of the shifts, astronomers can fairly directly determine two properties of the planet: One is the orbital period. The other is what?
Planet's Mass
On identifying an exosolar planet, a minimum mass for the planet can be determined from the changes in the star's radial velocity.
4. Pick the one true Statments about reflecting telescopes
It uses mirrors to focus light.
Isaac Netwon developed the Reflecting telescope, which uses mirrors to reflect light and thus avoids chromatic aberation and with parabolicm mirros even spherical aberation is avoided.
5. True or false. The three major functions of a telescope are magnification, making objects brighter, and improving resolution?
True
6. What problem does "adaptive optics" overcome?
Blurring caused by Earth's atmosphere.
Adaptive optics consists of a reflecting telescope with a flexible mirror and pressure-producing devices such as piezoelectric crystals behind it. It continually makes minor changes to the shape of the mirror to compensate for atmospheric turbulence; the effect that makes stars twinkle
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