APOD260125 火卫一:火星的末日之月
火卫一:火星的末日之月
图像提供: NASA[1], LPL (U. Arizona)[2], MRO[3], HiRISE[4]
英文原文:Explanation: This moon is doomed. Mars , the red planet named for the Roman god of war , has two tiny moons, Phobos and Deimos , whose names are derived from the Greek for Fear and Panic . These martian moons may well be captured asteroids originating in the main asteroid belt between Mars and Jupiter or perhaps from even more distant reaches of our Solar System . The larger moon, Phobos , is indeed seen to be a cratered, asteroid-like object in this stunning color image from the robotic Mars Reconnaissance Orbiter , with objects as small as 10 meters visible. But Phobos orbits so close to Mars - about 5,800 kilometers above the surface compared to 400,000 kilometers for our Moon - that gravitational tidal forces are dragging it down. In perhaps 50 million years, Phobos is expected to disintegrate into a ring of debris. 说明: 这颗卫星注定要毁灭。火星,这颗以罗马战神命名的红色星球,拥有两颗小型卫星:火卫一(福波斯)和火卫二(戴莫斯),它们的名字分别源自希腊语,意为「恐惧」和「恐慌」。 火星[5],这颗以罗马战神[6]命名的红色行星,拥有两颗微小的卫星,分别是火卫一(福波斯)[7]和火卫二(戴莫斯)[8],它们的名称源自希腊语,意为「恐惧」和「惊慌」[9]。 这些火星的卫星[10]很可能是来自位于火星和木星[11]之间的主小行星[12]带的捕获小行星[13],或者可能来自我们太阳系[14]更遥远的区域。 在这张由火星侦察轨道卫星[15]拍摄的精美彩色图像中,较大的卫星火卫一[16]确实呈现出类似小行星布满陨石坑的形态,图像中甚至可以看到一些小至10公尺的物体。 然而,火卫一的轨道[17]距离火星如此之近,仅约5,800公里,而相比之下,我们的月球[18]距地球约40万公里,这使得重力潮汐力[19]正在将它拉向火星。 大约在5000万年后,火卫一预计将解体[20],形成一圈碎片环。
明日的图片: bubbling galaxy[21]
Authors & editors: Robert Nemiroff[22] (MTU[23]) & Jerry Bonnell[24] (UMCP[25])
NASA Official: Amber Straughn Specific rights apply[26].
NASA Web Privacy[27], Accessibility[28], Notices[29];
A service of: ASD[30] at NASA[31] / GSFC[32],
NASA Science Activation[33]
& Michigan Tech. U.[34]
太空天文实验室(成功大学物理系)
<br/> 编辑:<a href="mailto:hantzong.su@gmail.com" style="color:gray;" target="_blank">苏汉宗</a>
编辑:陈炳志[35]
[2]https://www.lpl.arizona.edu/
[3]https://science.nasa.gov/mission/mars-reconnaissance-orbiter/
[4]https://hirise.lpl.arizona.edu/
[5]https://science.nasa.gov/mars/
[6]https://mythopedia.com/topics/mars
[7]https://en.wikipedia.org/wiki/Phobos_(moon)
[8]https://en.wikipedia.org/wiki/Deimos_(moon)
[10]http://apod.nasa.gov/apod/ap031024.html
[11]https://science.nasa.gov/jupiter/jupiter-facts/
[12]https://science.nasa.gov/solar-system/asteroids/
[14]http://apod.nasa.gov/apod/ap220629.html
[15]https://science.nasa.gov/mission/mars-reconnaissance-orbiter/
[16]http://apod.nasa.gov/apod/ap201108.html
[17]http://apod.nasa.gov/apod/ap220509.html
[18]http://apod.nasa.gov/apod/ap020504.html
[19]https://science.nasa.gov/moon/tides/
[20]https://youtu.be/BJHRyjkmxss?t=122
[21]http://apod.nasa.gov/apod/ap260126.html
[22]http://www.phy.mtu.edu/faculty/Nemiroff.html
[24]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[26]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[27]https://www.nasa.gov/about/highlights/HP_Privacy.html
[28]https://www.nasa.gov/general/accessibility/
[29]https://www.nasa.gov/privacy/
[30]https://astrophysics.gsfc.nasa.gov/
[32]https://www.nasa.gov/centers/goddard/
[33]https://science.nasa.gov/learners
[35]mailto:alfred@ncku.edu.tw
http://apod.nasa.gov/apod/ap260125.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap260125.html