41) Which of the following statements about a globular cluster is true? If so, why can't they be detected? 3) Which of the following methods has led to the most discoveries of massive planets orbiting, C) detecting the gravitational effect of an orbiting planet by looking for the Doppler shifts in the. 12) Which of the following statements about apparent and absolute magnitudes is true? Is the planet terrestrial or jovian in nature? 31) Which of the following statements about neutrinos is not true? 4) What two forces are balanced in what we call gravitational equilibrium? 15) How can we determine an asteroid's reflectivity? B) strong magnetic fields slow convection and prevent hot plasma from entering the region. planets detected via the doppler technique have been mostly . So to make some sense of all the stuff I just said, most planets so far have been found using the Doppler and transit methods. What technique, C) finding the main-sequence turnoff point of the stars. Answer: D. 9) Planets detected via the Doppler technique have been mostly . Our modern theory of solar system formation—the nebular theory—successfully accounts for all the major features of our own solar system. A) big planets in edge-on orbits around small stars. So we can only detect a small fraction of the existing planets. What can you conclude about the extrasolar planets shown on this graph? The planetary transits block 2 % of the star's light. why are many of the newly detected extrasolar planets called hot jupiters. (Hint: To find the volume of the planet, use the formula for the volume of a sphere: 43π(radius)3. D) near the radius at which they orbit today. Amateur astronomers are able to detect extrasolar planets with backyard telescopes using the transit method. extrasolar planet orbits tend to be closer and more eccentric than in our Solar System. Jovian planets always form in the cold, outer regions of their star system; Terrestrial planets always form in the warm, inner regions of their star system; Jovian planets can migrate inward and disrupt the orbits of terrestrial planets. Which of the following statements are consistent with this revised theory? Because of the electromagnetic force, the two. Stellar orbits are point reflections of their planets’ orbits, scaled down by the planet-to-star mass ratios. The radial velocity technique is able to detect planets around low-mass stars, such as M-type (red dwarf) stars. 28) How do we think the "hot Jupiters" around other stars were formed? Historic Timeline A planetary tour through time. However, when the first hot Jupiters were discovered, their existence seemed inconsistent with the nebular theory because this theory predicts that __________. 31) Where did comets that are now in the Oort cloud originally form? 17) How do human-built nuclear power plants on Earth generate energy? A) Low-mass stars are cooler and less luminous than high-mass stars. The __________ successfully discovered thousands of extrasolar planets with a spacecraft that searched for transits among some 100,000 stars. As of 2006, around 200 extrasolar planets have been identified using the radial velocity technique. A) Asteroids formed inside the frost line, while comets formed outside. B) orbital radius. 39) Why are Cepheid variables so important for measuring distances in astronomy? The __________ was used to find a Jupiter-sized planet through careful measurements of the changing position of a star in the sky. D) It is about a quarter the size of the Moon. 8) Which is closest to the average distance between asteroids in the asteroid belt? C) Jupiter-mass, in very close orbits. The average separation of the planet and star, a, is simply the sum of the radii for circular orbits. C) Their luminosity can be inferred from their period. Which location represents a planet that has about the same composition as Earth but is larger in both size and mass. minimum mass, orbital radius, orbital eccentricity. A planet's size can be determined by observing its transit across a star. D) only the motion of star toward the observer is measured, not the full motion. As of 2006, around 200 extrasolar planets have been identified using the radial velocity technique. Planetary orbits that are face-on to our line of sight produce no Doppler shift in the stellar spectrum. 8) By itself, the Doppler technique provides a measure of a planet's . C) determining its mass from its gravitational pull on a spacecraft, satellite, or planet. Until the launch of Kepler it was the method that had found the most planets. B) by comparing its infrared thermal emission to its visible-light reflection, 16) If we know the size of an asteroid, we can determine its density by. A planet which is of similar proportions to Jupiter, exerts a slight Gravitational pull on its parent star. The repeating pattern of the stellar motion, 23) A planet is detected via the Doppler technique. Choose the correct statement representing the evidence that the planet orbiting 51 Pegasi is a hot Jupiter. The gas in the solar nebula would create a drag on the planets and their orbits would migrate inwards. Observations indicating that other planetary systems often have jovian planets orbiting close to their stars are best explained by what we call __________. If you have ever heard the changing pitch of a siren as it passed by, you have experienced the Doppler Shift first hand. 22) A planet is detected via the Doppler technique. Question 9 0.5 out of 0.5 points If every star had an Earth-like planet in an Earth-like orbit, how many could be detected by a transit? What is an Exoplanet? Much to the astronomy communities amazement, the first planet discovered via this technique was roughly half the size of Jupiter, but on an orbit significantly smaller than Mercury's! Which, B) Higher temperature would cause the rate of nuclear fusion to rise, which would increase the. B) Jupiter-mass, in Jupiter-like orbits. C) They formed as gas giants beyond the frost line and then migrated inwards. However, the two most promising techniques for finding more Earth-like extrasolar planets are direct imaging and transits (so long as we can improve our technology enough!) 11) Which layer of the Sun do we normally see? Current techniques can measure stellar motion to less than. 1) Which of the following statements about comets and asteroids is true? The Doppler Effect Wails and Redshifts . Just over 20 years ago, we were completely unaware of the existence of any planets outside our own solar system. However, then m p is large and m s is small it does have a noticable effect. (Hint: Because the mass of 51 Pegasi is about the same as the mass of our Sun, you can use Kepler's third law in its original form, p2=a3. Notice the four locations marked by the bold numbers 1 through 4. Using the method of Mathematical Insight Finding Sizes of Extrasolar Planets, calculate the radius of the transiting planet. 2) Approximately how many other planetary systems have been discovered to date? Most planets are detected by the Doppler wobble in the parent star or if the planet transits in front of the parent star. 28) Studies of sunquakes, or helioseismology, have revealed that. The velocity change of the star is a measure. 51 Pegasi is a planet whose orbital period is so short (4 days) that it must lie incredibly close to its star. The total amount of light from a star-planet system drops when the planet goes behind the star. 10) Planets detected via the Doppler technique have been mostlyA) a wide range of …