Explanation

• A constellation is a group of stars that, when viewed from Earth, form a pattern or shape that is recognizable.
• It has been given a specific name, such as Orion, Cassiopeia, or Ursa Major.

Explanation

• Nebulae are primarily made up of Hydrogen (97%) and Helium (3%).
• These vast clouds of gas and dust serve as the birthplace of stars, with hydrogen being the most abundant element in the universe.

Explanation

• Light from the Sun takes about 8 minutes to reach Earth due to the short distance of approximately 93 million miles.
• Light from Sirius, which is much farther away at about 8.6 light-years, takes approximately 8 years to reach us.

Explanation

The Earth and the Sun are approximately 25,000 light-years away from the center of the Milky Way galaxy.

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

• 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

• 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

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

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

Explanation

• Resistance (C) is the opposition to the flow of electric current.
• It is measured in ohms (Ω).