Science & Research

  1. Ricky is conducting a penetration test against a web application and is looking for potential vulnerabilities to exploit. Which of the following vulnerabilities does not commonly exist in web applications? A. SQL injection B . VM escape C. Buffer overflow D. Cross-site scripting 2. What specialized type of legal document is often used to protect the confidentiality of data and other information that penetration testers may encounter? A. An SOW B. An NDA C. An MSA D. A noncompete 3. Chris is assisting Ricky with his penetration test and would like to extend the vulnerability search to include the use of dynamic testing. Which one of the following tools can he use as an interception proxy? A . ZAP B. Nessus C. SonarQube D. OLLYDBG 4. Matt is part of a penetration testing team and is using a standard toolkit developed by his team. He is executing a password cracking script named password.sh. What language is this script most likely wr...

Even if you don’t keep up with developments in space propulsion technology, you’ve still probably heard about the EmDrive.  You’ve probably seen headlines declaring it  the key to interstellar travel , and claims that it will drastically reduce travel time across our solar system, making our dreams of people walking on other planets even more of a reality. There have even been claims that this highly controversial technology is the key to creating warp drives . Simply put, the EmDrive is a conundrum. First designed in 2001 by aerospace engineer Roger Shawyer, the technology can be summed up as a propellant less propulsion system, meaning the engine doesn’t use fuel to cause a reaction. Removing the need for fuel makes a craft substantially lighter, and therefore easier to move (and cheaper to make, theoretically). In addition, the hypothetical drive is able to reach extremely high speeds — we’re talking potentially getting humans to the outer reaches of th...

This article is part of the  NASA Knows! (Grades 5-8)  series.   What Shape Is an Orbit? Orbits come in different shapes. All orbits are elliptical, which means they are an  ellipse , similar to an oval. For the planets, the orbits are almost circular. The orbits of comets have a different shape. They are highly eccentric or "squashed." They look more like thin ellipses than circles. How Do Objects Stay in Orbit? An object in motion will stay in motion unless something pushes or pulls on it. This statement is called Newton's first law of motion. Without gravity, an Earth-orbiting satellite would go off into space along a straight line. With gravity, it is pulled back toward Earth. A constant tug-of-war takes place between the satellite's tendency to move in a straight line, or momentum, and the tug of gravity pulling the satellite back. Where Do Satellites Orbit Earth? The International Space Station is in low Earth orbit, or LEO. LEO is the first 100 to 20...

Missile is a weapon that is self-propelled or directed by remote control, carrying conventional or nuclear explosive.  There are three broad types of missiles Conventional guided missiles Cruise missiles Ballistic missiles Difference between cruise and ballistic missile  A Cruise Missile is a guided missile that flies with constant speed to deliver a warhead at specified target over long distance with high accuracy. A Ballistic Missile is launched directly into the high layers of the earth’s atmosphere. Cruise missile is classified by size, range, speed and launch type. Ballistic missile is classified based on its range, maximum distance measured along the earth’s ellipsoid from point of launch to point of impact of last element of their payload. Cruise missile flies with in earth’s atmosphere and use jet engine technology. Cruise missiles are known specifically for low-level flight which is staying relatively close to the surfa...

A  radioisotope thermoelectric generator  ( RTG ,  RITEG ) is an  electrical generator It is an  electrical generator  that uses an array of  thermocouples  to convert the  heat released by the decay  of a suitable  radioactive  material into  electricity  by the  Seebeck effect . RTGs have been used as power sources in  satellites ,  space probes , and uncrewed remote facilities such as a series of  lighthouses  built by the former  Soviet Union  inside the  Arctic Circle . RTGs are usually the most desirable power source for unmaintained situations that need a few hundred  watts  (or less) of power for durations too long for  fuel cells , batteries, or generators to provide economically, and in places where  solar cells  are not practical. Safe use of RTGs requires containment of the  radioisotopes  long after the productive life of the un...