A Was not surprising, because the existence of a massive "Planet X" had be B Was surprising, due to its "backwards" orbit around the Sun. C Was surprising, since we thought we knew about all large objects in the s
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The discovery of Eris
A Was not surprising, because the existence of a massive "Planet X" had been predicted nearly a century ago.
B
Was surprising, due to its "backwards" orbit around the Sun.
C Was surprising, since we thought we knew about all large objects in the solar system.
Was not surprising, because other Kuiper belt objects approaching the size of Pluto had already been discovered.
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- Plant A orbits a star at a distance R from the center of the star. Planet B circles the same star with a period eight times that of Planet A. Planet B orbits the star at a distance of. a. 4R b. 1/8R c. 8R c. 1/4RA satellite in orbit around the earth is at an altitude of 107 percent of the earth's radius. Rounding off our old friend "g" to ten meters per second squared, what is the acceleration due to earth's gravity at the satellite? Your answer should be in meters per second squared, but do not put the unit, just the number.Calculate the escape velocity to an orbit of 457 km height from a planet with the radius of 2000 km and the density of 3400 kg⋅m-³. Give your answer in Sl units.
- How many orders of magnitude do you need to grow in spatial scale (size) to form a planet? Let's take the extreme ends of this scale, from a dust particle of radius a = 10-6m to the gas giant Jupiter (you can round up its radius to the nearest ten to keep it simple). What else has this difference in order of magnitude? Maybe pick something that's not a length scale. Be creative!Kepler's 1st law says that our Solar System's planets orbit in ellipses around the Sun where the closest distance to the Sun is called perihelion. Suppose I tell you that there is a planet with a perihelion distance of 2 AU and a semi-major axis of 1.5 AU. Does this make physical sense? Explain why or why not.Two large asteroids start with an initial separation of r0, at which time they each exert a gravitational force on the other of strength F0. After they have fallen toward each other for a period of time, their separation has decreased to 0.38r0. At that moment, what is the strength of the new gravitational force that each asteroid feels, in terms of F0? Blank 1. Calculate the answer by read surrounding text. times F0. Express your final answer to at least 3 significant figures.
- The radius of the Earth's orbit is 1.50 x 1011 m and that of Pluto is 5.93 x 1012 m. The star that this planet orbits is identical to our Sun. What is the orbital period of this planet? years eBook19 A planet is detected via the Doppler technique. The velocity change of the star is a measure of A The planet's size and density. B C D E The planet's mass and orbital distance. The planet's orbital period and eccentricity. The planet's mass and composition. The planet's size and orbital distance.1. Moon is at the distance 384400 km from Earth and orbits the Earth every ~28 days. If the radius of the Moon is 1737 km (consider it to be spherical), what is the area of the moon as measured by the observer on Earth? (Hint: Length contraction)
- Until recently, the term "planet" had no clear-cut definition. In August of 2006, leading astronomers established new guidelines and declared that Pluto is no longer a planet. Which of the following is either false or least consistent with the new guidelines? Group of answer choices Pluto is by far the largest known object in the Kuiper belt, while Eris is the largest known object in the asteroid belt. A planet must have cleared the neighborhood around its orbit. Pluto is automatically disqualified from being a planet because its oblong orbit overlaps with Neptune's. A planet must have sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a nearly round shape. Pluto and the asteroid Ceres are both now classified as dwarf planets.20) Planet Dwovy circles its star at a distance of 8.75 × 109 km once every 325 Earth years. The planet Spitnik circles the same star at a distance of 76.1 × 109 km. What is the orbital period of Spitnik in Earth years? a) 65,800 years b) 2570 years c) 0.004 years d) 8336 years e) 257 yearsPlanet X is four times as massive as its moon Y and their centers are separated by 100,000 km. Relative to the center of planet X, about what point (the center of mass) does the planet-moon system orbit? A) d= 12,000 km from planet X’s center B) d= 16,000 km from planet X’s center C) d= 20,000 km from planet X’s center D) d= 24,000 km from planet X’s center E) d= 48,000 km from planet X’s center