question: Why does it look like other planets get hit by meteors/asteroids a lot more than Earth?
comment: The Earth and Titan are the only planetoid with a significant atmosphere. The reason is that most of them are either too light to keep an atmosphere, or doesn't have a magnetosphere to protect the atmosphere from solar radiation. The Atmosphere will create friction with any asteroid which gonna decrease their size. So only the larger asteroid can reach the ground and of course those are rarer. That said each year on average an meteorite the size of a car hit the earth. & #x200B; In addition, the Earth surface move enough that most of the impact become hidden over time, and this doesn't happen as much on other planet, so we can see impact that are much older on those planet. On Earth you have water that can hide an impact, erosion from water and wind that make the impact crater smaller or less apparent, you have flora that can cover it, you have tectonic plates or volcano that can remake the surface or cover an impact.
passages: Many planets and moons have impact craters dating back large spans of time. But new craters, perhaps even related to meteor showers are possible. Mars, and thus its moons, is known to have meteor showers. These have not been observed on other planets as yet but may be presumed to exist. For Mars in particular, although these are different from the ones seen on Earth because the different orbits of Mars and Earth relative to the orbits of comets. The Martian atmosphere has less than one percent of the density of Earth's at ground level, at their upper edges, where meteoroids strike, the two are more similar. Because of the similar air pressure at altitudes for meteors, the effects are much the same. Only the relatively slower motion of the meteoroids due to increased distance from the sun should marginally decrease meteor brightness. This is somewhat balanced in that the slower descent means that Martian meteors have more time in which to ablate.
   The cratering records of very old surfaces, such as Mercury, the Moon, and the southern highlands of Mars, record a period of intense early bombardment in the inner Solar System around 3.9 billion years ago. The rate of crater production on Earth has since been considerably lower, but it is appreciable nonetheless; Earth experiences from one to three impacts large enough to produce a crater about once every million years on average. This indicates that there should be far more relatively young craters on the planet than have been discovered so far. The cratering rate in the inner solar system fluctuates as a consequence of collisions in the asteroid belt that create a family of fragments that are often sent cascading into the inner solar system. Formed in a collision 160 million years ago, the Baptistina family of asteroids is thought to have caused a large spike in the impact rate. Note that the rate of impact cratering in the outer Solar System could be different from the inner Solar System.
   When a near-Earth object impacts Earth, objects up to a few tens of metres across ordinarily explode in the upper atmosphere (usually harmlessly), with most or all of the solids vaporized, while larger objects hit the water surface, forming waves, or the solid surface, forming impact craters.
   Meteoroids also hit other bodies in the Solar System. On such stony bodies as the Moon or Mars that have little or no atmosphere, they leave enduring craters.
  
  Section::::Meteorites.:Frequency of impacts.
  
  The diameter of the largest impactor to hit Earth on any given day is likely to be about , in a given year about , and in a given century about . These statistics are obtained by the following:
  
  Over at least the range from to roughly , the rate at which Earth receives meteors obeys a power-law distribution as follows:
   BULLET::::- 92.93 ±0.09
  
  BULLET::::- 92.83 ±0.01
  
  BULLET::::- 92.66 ±0.11
  
  BULLET::::- 92.63 ±0.03
  
  BULLET::::- 90 ±250
  
  BULLET::::- 92.40 ±0.08
  
  BULLET::::- 91.91 ±0.06
  
  BULLET::::- 91.89 ±0.04
  
  BULLET::::- 91.82 ±0.14
  
  BULLET::::- 91.60 ±0.54
  
  BULLET::::- 91.38 ±0.01
  
  BULLET::::- 91.27 ±0.05
  
  BULLET::::- 90.97 ±0.13
  
  BULLET::::- 90.94 ±0.02
  
  BULLET::::- 90.91 ±0.01
  
  BULLET::::- 90 ±190
  
  BULLET::::- 90.30 ±0.49
  
  BULLET::::- 90.15 ±0.05
  
  BULLET::::- 90 ±22
  
  Section::::Minor planets.:Greatest barycentric aphelion.
  
  The following asteroids have an incoming barycentric aphelion of at least 1000 AU.
  
  Section::::See also.
  
  BULLET::::- List of trans-Neptunian objects (numbered minor planets only)
  
  BULLET::::- List of unnumbered trans-Neptunian objects
  
  BULLET::::- List of artificial objects leaving the Solar System
   where "N" is the number of encounters per million years that come within a radius "D" of the Sun in parsecs. For comparison, the mean radius of the Earth's orbit, 1 AU, is .
   For reference, the radius of Earth is approximately or 0.0166 Lunar distances.The orbit of geosynchronous satellites, however, is or 0.110 Lunar distances. This year, 3 asteroids were detected which traveled nearer than this, most notably 2014 AA, which impacted. This list does not include any of the other 32 objects that collided with earth in 2014, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices (of the 33 objects detected 5 had an impact energy greater than that of a 1 kiloton device) .
   This list does not include any of the 24 objects that collided with earth in 2013, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices. Of the 24 objects so detected, 5 had an impact energy greater than that of a 1 kiloton device including the 440 kiloton Chelyabinsk meteor, estimated at 20 m in diameter, which injured around 1500 people and damaged over 7000 buildings. 
  
  Section::::Additional examples.
  
  An example list of near-Earth asteroids that passed more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2013.
   Objects which enter and then leave Earth's atmosphere, the so-called 'Earth-grazers,' are a distinct phenomenon, in as much as entering the lower atmosphere can constitute an impact event rather than a close pass. Earth grazer can also be short for a body that "grazes" the orbit of the Earth, in a different context.
  
  Section::::External links.
  
  BULLET::::- Sentry Risk Table — Jet Propulsion Laboratory
  
  BULLET::::- "PHA Close Approaches To The Earth" — Minor Planet Center
  
  BULLET::::- "NEO Earth Close Approaches" — NASA/JPL's Near-Earth Object Program Office
   From the lists in the first section, these are the largest known asteroids per year that approach Earth within one LD. (More than one asteroid per year may be listed if its size is or more.) For comparison, the 1908 Tunguska event was caused by an object about in size, while the 2013 Chelyabinsk meteor which injured thousands of people and buildings when it generated a large airburst over Russia was estimated to be just across.
   The following group of bodies have orbits with an aphelion between 100 and 200 AU.
  
  BULLET::::- 200 ±5500000
  
  BULLET::::- 198.71 ±0.11
  
  BULLET::::- 192.58 ±0.13
  
  BULLET::::- 186.92 ±0.02
  
  BULLET::::- 186.33 ±0.03
  
  BULLET::::- 185.68 ±0.51
  
  BULLET::::- 185.08 ±0.05
  
  BULLET::::- 182.86 ±0.02
  
  BULLET::::- 182.01 ±0.02
  
  BULLET::::- 179.21 ±0.09
  
  BULLET::::- 179 ±16
  
  BULLET::::- 177.93 ±0.19
  
  BULLET::::- 177.69 ±0.04
  
  BULLET::::- 177.2 ±3.5
  
  BULLET::::- 173.89 ±0.07
  
  BULLET::::- 173.56 ±0.07
  
  BULLET::::- 173.11 ±0.12
  
  BULLET::::- 172.85 ±0.03
  
  BULLET::::- 172.23 ±0.12
  
  BULLET::::- 171.96 ±0.23
  
  BULLET::::- 169.90 ±0.09
  
  BULLET::::- 169.7 ±5.3
  
  BULLET::::- 168.75 ±0.07
  
  BULLET::::- 2018 VG18 168.7
  
  BULLET::::- 166 ±23
  
  BULLET::::- 164.26 ±0.09
  
  BULLET::::- 161.22 ±0.03
  
  BULLET::::- 160.36 ±0.03
   Current mechanisms for detecting asteroids on final approach rely on ground based telescopes with wide fields of view. Those currently can monitor the sky at most every second night, and therefore miss most of the smaller asteroids which are bright enough to detect for less than two days. Such very small asteroids much more commonly impact Earth than larger ones, but they make little damage. Missing them therefore has limited consequences. Much more importantly, ground-based telescopes are blind to most of the asteroids which impact the day side of the planet and would miss even large ones. These and other problems mean very few impacts are successfully predicted (see §Effectiveness of the current system and §Improving impact prediction).
   The diagram below illustrates the number of successfully predicted impacts each year compared to the number of unpredicted asteroid impacts recorded by infrasound sensors designed to detect detonation of nuclear devices. It shows that the vast majority are still missed due to their small size and dimness, and because approximately half occur on the day side of the Earth.
   BULLET::::- 114.06 ±0.04
  
  BULLET::::- 114.04 ±0.80
  
  BULLET::::- 114.02 ±0.13
  
  BULLET::::- 113.59 ±0.04
  
  BULLET::::- 112.82 ±0.62
  
  BULLET::::- 111.64 ±0.01
  
  BULLET::::- 111.63 ±0.05
  
  BULLET::::- 111.05 ±0.47
  
  BULLET::::- 110.82 ±0.06
  
  BULLET::::- 111 ±14
  
  BULLET::::- 110.69 ±0.07
  
  BULLET::::- 110.30 ±0.08
  
  BULLET::::- 110.16 ±0.03
  
  BULLET::::- 109.35 ±0.28
  
  BULLET::::- 109.30 ±0.61
  
  BULLET::::- 110 ±150
  
  BULLET::::- 108.70 ±0.06
  
  BULLET::::- 108.68 ±0.06
  
  BULLET::::- 108.67 ±0.06
  
  BULLET::::- 108.61 ±0.03
  
  BULLET::::- 108.54 ±0.02
  
  BULLET::::- (229762) Gǃkúnǁʼhòmdímà 108.28 ±0.01
  
  BULLET::::- 108.26 ±0.04
  
  BULLET::::- 108.04 ±0.04
  
  BULLET::::- 107.71 ±0.01
  
  BULLET::::- 107.46 ±0.08
  
  BULLET::::- 107.40 ±0.03
  
  BULLET::::- 107.22 ±0.02
  
  BULLET::::- 107.11 ±0.18
  
  BULLET::::- 107.09 ±0.03
  
  BULLET::::- 106 ±72
  
  BULLET::::- 106.19 ±0.28
   Near-Earth objects are classified as meteoroids, asteroids, or comets depending on size and composition. Asteroids can also be members of an asteroid family, and comets create meteoroid streams that can generate meteor showers.
  
  , according to statistics maintained by CNEOS, 19,470 NEOs have been discovered. Only 107 (0.55%) of them are comets, whilst 19,363 (99.45%) are asteroids. There are 1,955 NEOs that are classified as potentially hazardous asteroids (PHAs).
   Small objects frequently collide with Earth. There is an inverse relationship between the size of the object and the frequency of such events. The lunar cratering record shows that the frequency of impacts decreases as approximately the cube of the resulting crater's diameter, which is on average proportional to the diameter of the impactor. Asteroids with a diameter strike Earth every 500,000 years on average. Large collisions – with objects – happen approximately once every twenty million years. The last known impact of an object of or more in diameter was at the Cretaceous–Paleogene extinction event 66 million years ago.
   Crater counts give an important estimate for the age of the surface of a planet. Over time, bodies in the Solar System are randomly impacted, so the more craters a surface has, the older it is. Compared to Mercury, the Moon and other such bodies, Venus has very few craters. In part, this is because Venus's dense atmosphere burns up smaller meteorites before they hit the surface. The "Venera" and "Magellan" data agree: there are very few impact craters with a diameter less than , and data from "Magellan" show an absence of any craters less than in diameter. However, there are also fewer of the large craters, and those appear relatively young; they are rarely filled with lava, showing that they happened after volcanic activity in the area, and radar shows that they are rough and have not had time to be eroded down.
   BULLET::::- 105.99 ±0.01
  
  BULLET::::- 105.83 ±0.10
  
  BULLET::::- 105.43 ±0.06
  
  BULLET::::- 104.90 ±0.01
  
  BULLET::::- 104.69 ±0.04
  
  BULLET::::- 104.12 ±0.01
  
  BULLET::::- 103.84 ±0.01
  
  BULLET::::- 104 ±16
  
  BULLET::::- 103.64 ±0.02
  
  BULLET::::- 103.63 ±0.04
  
  BULLET::::- 104 ±8
  
  BULLET::::- 103.47 ±0.42
  
  BULLET::::- 103.30 ±0.16
  
  BULLET::::- 103.17 ±0.27
  
  BULLET::::- 102.90 ±0.01
  
  BULLET::::- 102.64 ±0.01
  
  BULLET::::- 102 ±98
  
  BULLET::::- 100 ±74000
  
  BULLET::::- 101 ±12
  
  BULLET::::- 101.17 ±0.01
  
  BULLET::::- 101.13 ±0.05
  
  BULLET::::- 101.00 ±0.01
  
  BULLET::::- 100.86 ±0.03
  
  BULLET::::- 100.82 ±0.04
  
  BULLET::::- 100 ±6200
  
  BULLET::::- 100.36 ±0.51
  
  BULLET::::- 100.18 ±0.13
  
  Section::::Minor planets.:TNOs with an aphelion between 90 and 100 AU.
  
  BULLET::::- 99.9 ±1.9
  
  BULLET::::- 100 ±2800
  
  BULLET::::- 100 ±72000
   BULLET::::- C/1974 F1 (Lovas) 15129
  
  BULLET::::- C/2013 J5 (Boattini) 14297
  
  BULLET::::- C/2006 Q1 (McNaught) 13768
  
  BULLET::::- C/2014 Q6 (PANSTARRS) 13761
  
  BULLET::::- C/1975 V1-A (West) 13560
  
  BULLET::::- C/1999 F1 (Catalina) 13390
  
  Section::::Comets with greatest aphelion (2 body heliocentric).:Distant periodic comets with well-known aphelion.
  
  These can also change significantly such as if perturbed by Jupiter
  
  BULLET::::- 153P/Ikeya–Zhang (0.5–102)
  
  BULLET::::- 273P/Pons–Gambart (0.8–63)
  
  BULLET::::- 35P/Herschel–Rigollet (0.7–57 AU, returns in 2092)
  
  BULLET::::- Comet Swift–Tuttle (0.96-51 AU)
  
  BULLET::::- 177P/Barnard (1–47)
  
  BULLET::::- Halley's Comet (0.59-35, for many years the most distant aphelion known)
  
  BULLET::::- 165P/LINEAR (7–29)
  
  BULLET::::- 122P/de Vico (0.6–34)
  
  BULLET::::- 12P/Pons–Brooks (0.7–33.5)
   Earth-based radar surveys made it possible to identify some topographic patterns related to craters, and the "Venera 15" and "Venera 16" probes identified almost 150 such features of probable impact origin. Global coverage from "Magellan" subsequently made it possible to identify nearly 900 impact craters. 
   There are over 20,000 known near-Earth asteroids (NEAs), over a hundred short-period near-Earth comets (NECs), and a number of solar-orbiting spacecraft and meteoroids large enough to be tracked in space before striking the Earth. It is now widely accepted that collisions in the past have had a significant role in shaping the geological and biological history of the Earth. NEOs have become of increased interest since the 1980s because of greater awareness of the potential danger. Asteroids as small as 20 m can damage the local environment and populations. Larger asteroids penetrate the atmosphere to the surface of the Earth, producing craters or tsunamis. Asteroid impact avoidance by deflection is possible in principle, and methods of mitigation are being researched.
   Section::::Number and classification.:Near-Earth comets.
  
  Near-Earth comets (NECs) are objects in a near-Earth orbit with a tail or coma. Comet nuclei are typically less dense than asteroids but they pass Earth at higher relative speeds, thus the impact energy of comet nucleus is slightly larger than that of a similar-sized asteroid. NECs may pose an additional hazard due to fragmentation: the meteoroid streams which produce meteor showers may include large inactive fragments, effectively NEAs. Although no impact of a comet in Earth's history has been conclusively confirmed, the Tunguska event may have been caused by a fragment of Comet Encke.
   BULLET::::- 626.7 ±5.6
  
  BULLET::::- 583.6 ±3.2
  
  BULLET::::- 582 ±20
  
  BULLET::::- 570.76 ±0.18
  
  BULLET::::- 560 ±56
  
  BULLET::::- 545 ±33
  
  BULLET::::- 532.13 ±0.29
  
  BULLET::::- 524.28 ±0.14
  
  BULLET::::- 500.56 ±0.64
  
  BULLET::::- 444 ±4000
  
  BULLET::::- 431.2 ±2.3
  
  BULLET::::- 421.47 ±0.08
  
  BULLET::::- 419.14 ±0.12
  
  BULLET::::- 414.5 ±7.7
  
  BULLET::::- 402.41 ±0.99
  
  BULLET::::- 398.1 ±1.1
  
  BULLET::::- 377 ±130
  
  BULLET::::- 372.37 ±0.17
  
  BULLET::::- 360 ±180
  
  BULLET::::- 360 ±270
  
  BULLET::::- 352.6 ±2.6
  
  BULLET::::- 347.5 ±1.4
  
  BULLET::::- 346.89 ±0.13
  
  BULLET::::- 342.26 ±0.22
  
  BULLET::::- 342.13 ±0.30
  
  BULLET::::- 328.97 ±0.75
  
  BULLET::::- 328 ±2300
  
  BULLET::::- 313.15 ±0.12
  
  BULLET::::- 305 ±15
  
  BULLET::::- 294.2 ±1.2
  
  BULLET::::- 290.51 ±0.07
  
  BULLET::::- 274.4 ±1.0
  
  BULLET::::- 272.23 ±0.13
   Section::::The Asteroid Belt.:87 Sylvia and its moons Romulus and Remus.
   Since Mars has an atmosphere that is relatively transparent at optical wavelengths (just like Earth, albeit much thinner), meteors will occasionally be seen. Meteor showers on Earth occur when the Earth intersects the orbit of a comet, and likewise, Mars also has meteor showers, although these are different from the ones on Earth.
  