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blackhole mass

- 2월 04, 2023

Black holes can have a wide range of masses, from a few times that of the Sun to several billion times. The mass of a black hole is one of the most important factors that determine its properties, such as its size, event horizon, and gravitational pull. Astronomers can measure the mass of a black hole by observing its effects on nearby objects, such as stars, or by studying the motion of stars and gas in the vicinity of a black hole. The largest known black hole is located in the center of the galaxy NGC 4889 and has a mass estimated to be around 21 billion times that of the Sun.

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Universe mass

- 2월 04, 2023

The total mass of the universe is not well defined and cannot be measured directly. However, estimates of its mass have been made based on the distribution of matter and its gravitational effects. Using various observations, such as the cosmic microwave background radiation, the distribution of large scale structures, and the motion of galaxies, astronomers have estimated that the total mass of the universe is between 10^53 and 10^54 kilograms. This is a vast quantity and is estimated to be equivalent to approximately 10^80 protons. It's important to note that this is only the total matter and energy content of the observable universe. Beyond the observable limit, there may be even more matter and energy that we cannot detec

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Rimworld route port forward(림월드 멀티 플레이 위한 공유기 설정)

- 12월 31, 2022

rimworld multiplayer router port forwarding pc rimworld 30502 tcp and udp really direct connect multiplay able to well play don,t need hamachi

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버처얼박스에서 호스트 usb printer 연결 위해서 설정할것

- 4월 10, 2022

버처얼박스에서 호스트 usb printer 연결 위해서 설정할것 usb 장치 추가 리스트가 뜨지 않을때 아래 처럼 실행하고 다시시작 하면 나타 난다. I might not have the complete technical understanding here, but from what i gather, the default install of virtualbox will install the /usr/lib/udev/rules.d/ 60-vboxdrv.rules that has this content: KERNEL == "vboxdrv" , NAME= "vboxdrv" , OWNER= "root" , GROUP= "root" , MODE= "0600" KERNEL == "vboxdrvu" , NAME= "vboxdrvu" , OWNER= "root" , GROUP= "root" , MODE= "0666" KERNEL == "vboxnetctl" , NAME= "vboxnetctl" , OWNER= "root" , GROUP= "root" , MODE= "0600" SUBSYSTEM == "usb_device" , ACTION== "add" , RUN+= "/usr/share/virtualbox/VBoxCreateUSBNode.sh $major $minor $attr{bDeviceClass} vboxusers" SUBSYSTEM == "usb" , ACTION== "add" , ENV{DEVTYPE}== "usb_device" , RUN+= "/usr/share...