Astronomical Objects | MCQs

Explanation

• The Earth is part of the Milky Way Galaxy.
• It is a barred spiral galaxy containing hundreds of billions of stars, gas, and dust.

Explanation

• Blue stars are hotter than red and orange stars.
• The temperature of stars increases from red to orange to yellow to white to blue, with blue stars being the hottest.

Explanation

• The hottest stars are the blue stars, and their temperature is around 25,000°C.
• These stars emit blue light due to their extremely high surface temperatures, which can range from 20,000 to over 30,000 degrees Celsius.

Explanation

•  Sun has a temperature of around 6,000 °C and glows orange/yellow.
• This color is due to the blackbody radiation emitted by the Sun at this temperature, which peaks in the visible spectrum around yellow.

Explanation

• The Sun has a temperature of around 6,000 °C and glows orange/yellow.
• This color is due to the blackbody radiation emitted by the Sun at this temperature, which peaks in the visible spectrum around yellow.

Explanation

• Red stars, also known as red dwarfs, typically have a surface temperature around 3000°C (5400°F).
• This is the coolest temperature range for stars, and it's what gives them their distinctive red color.

Explanation

• Red stars, also known as red dwarfs, typically have a surface temperature around 3000°C (5400°F).
• This is the coolest temperature range for stars, and it's what gives them their distinctive red color.

Explanation

• The next closest star system to Earth after the Sun is known as Alpha Centauri.
• Specifically, Proxima Centauri, which is part of the Alpha Centauri star system, is the closest individual star to Earth, located approximately 4.24 light-years away.

Explanation

• Nuclear fusion is the process by which atomic nuclei combine to form a heavier nucleus, releasing vast amounts of energy in the process.
• In the case of stars, nuclear fusion occurs when hydrogen atoms fuse together to form helium, releasing energy in the form of light and heat.

Explanation

Stars are massive, luminous balls of gas that are primarily composed of:

• Hydrogen (about 70%)
• Helium (about 28%)