Posted on April 22, 2022 (Updated on July 9, 2025)
How is solar activity measured?
Space & NavigationMeasurement. Since 1978, solar irradiance has been directly measured by satellites with very good accuracy. These measurements indicate that the Sun’s total solar irradiance fluctuates by +-0.1% over the ~11 years of the solar cycle, but that its average value has been stable since the measurements started in 1978. How do we measure solar activity?
Posted on April 22, 2022 (Updated on July 9, 2025)
Why does a curved mirror create a distorted image?
Space & NavigationFor a concave mirror the skewers point toward each other, and the reflected light rays spread out less. The reflection of an object close to the mirror is bigger and looks farther away. What would happen to an image if the mirror is curved? Reflection from a Concave Mirror The image is real light rays
Posted on April 22, 2022 (Updated on July 9, 2025)
What is are the major differences between a meter stick and a vernier caliper?
Space & NavigationUnlike a meter stick, the vernier caliper allows the fractional part of the smallest division to be accurately determined, not merely estimated. The vernier consists of a main scale engraved on a fixed ruler and an auxiliary scale engraved on a moveable jaw (see Figure 3). What is the main difference between vernier caliper and
Posted on April 22, 2022 (Updated on July 9, 2025)
What is a square root expression?
Space & NavigationA square root is written with a radical symbol √ and the number or expression inside the radical symbol, below denoted a, is called the radicand. √a. To indicate that we want both the positive and the negative square root of a radicand we put the symbol ± (read as plus minus) in front of
Posted on April 22, 2022 (Updated on July 9, 2025)
What is the correct order of star colors from hottest to coolest?
Space & NavigationRed stars are the coolest. Yellow stars are hotter than red stars. White stars are hotter than red and yellow. Blue stars are the hottest stars of all. What is the correct order of stars from hottest to coolest? The seven main types are M, K, G, F, A, B and O. M stars are
Posted on April 22, 2022 (Updated on July 9, 2025)
Why do coronal mass ejections occur?
Space & NavigationBottom line: Coronal mass ejections – also knowns as CMEs – are powerful eruptions on the sun’s surface. Caused by instabilities in the sun’s magnetic field, they can launch a billion tons of superheated gas into space. Most drift harmlessly across the solar system, but occasionally one is aimed at Earth. How is CME formed?