EA L1

<p>The Big Bang</p> Signup and view all the answers

<p>Hydrogen</p> Signup and view all the answers

<p>Emma Cummins</p> Signup and view all the answers

<p>Cooling</p> Signup and view all the answers

<p>Fusion</p> Signup and view all the answers

<p>Doppler effect</p> Signup and view all the answers

<p>13.8 billion years</p> Signup and view all the answers

<p>Hydrogen</p> Signup and view all the answers

<p>Element formation</p> Signup and view all the answers

<p>Fission</p> Signup and view all the answers

<p>Crust, core, mantle</p> Signup and view all the answers

<p>Iron</p> Signup and view all the answers

<p>A substance that has the same number of protons</p> Signup and view all the answers

<p>Substances that have the same number of protons but different number of neutrons</p> Signup and view all the answers

<p>The Big Bang</p> Signup and view all the answers

<p>Stars that are in the process of becoming a star</p> Signup and view all the answers

<p>High temperature and high pressure</p> Signup and view all the answers

<p>The evolution of stars</p> Signup and view all the answers

<p>The fusion of hydrogen nuclei</p> Signup and view all the answers

<p>The stage where the star fuses hydrogen into helium</p> Signup and view all the answers

<p>It becomes a red giant</p> Signup and view all the answers

<p>The white dwarf</p> Signup and view all the answers

<p>The temperature and pressure</p> Signup and view all the answers

<p>A high temperature and high pressure</p> Signup and view all the answers

<p>The fusion reactions</p> Signup and view all the answers

<p>The formation of nebulae</p> Signup and view all the answers

<p>It forms a protostar</p> Signup and view all the answers

<p>Fusion</p> Signup and view all the answers

<p>13.8 billion years old</p> Signup and view all the answers

<p>High temperature and pressure</p> Signup and view all the answers

<p>The Doppler effect</p> Signup and view all the answers

<p>Hydrogen</p> Signup and view all the answers

<p>Different types of the same element with different numbers of neutrons</p> Signup and view all the answers

<p>The Big Bang</p> Signup and view all the answers

<p>Lysotopes are different isotopes of an element.</p> Signup and view all the answers

<p>The Earth is primarily made up of iron, oxygen, silicon, and magnesium.</p> Signup and view all the answers

<p>The process is called the formation of nebulae.</p> Signup and view all the answers

<p>Protostars are early stages of stars that are formed from collapsing gas and dust.</p> Signup and view all the answers

<p>The cooling of the universe allowed chemical bonds to form and bind atoms into molecules.</p> Signup and view all the answers

<p>A protostar becomes a star through fusion reactions that generate helium, which require high temperature and pressure.</p> Signup and view all the answers

<p>The next lecture will cover the evolution of stars in detail.</p> Signup and view all the answers

<p>The three main stages in the evolution of a star are the main sequence, red giant, and white dwarf.</p> Signup and view all the answers

<p>Fusion in a star is the process of hydrogen nuclei slamming into each other, causing fusion reactions that generate helium.</p> Signup and view all the answers

<p>The sun is powered by the energy released from fusion reactions.</p> Signup and view all the answers

<p>The mass of a star determines its evolution. The more massive the star, the shorter its lifespan.</p> Signup and view all the answers

<p>The main sequence stage of a star's evolution is the longest stage, where hydrogen is fused into helium.</p> Signup and view all the answers

<p>As a star's hydrogen fuel runs out, it expands and becomes a red giant.</p> Signup and view all the answers

<p>Fusion in a star requires high temperature and high pressure to get particles close enough to fuse.</p> Signup and view all the answers

<p>The estimated age of the universe is approximately 13.8 billion years.</p> Signup and view all the answers

<p>The primary element in the universe is hydrogen.</p> Signup and view all the answers

<p>Redshift refers to the shift in light wavelengths towards the red part of the spectrum due to the movement of an object away from an observer. This phenomenon is related to the Doppler effect, which occurs when an object moves towards or away from an observer, compressing or stretching sound waves, respectively.</p> Signup and view all the answers

<p>The Doppler effect is the compression or stretching of sound waves that occurs when an object moves towards or away from an observer. This effect can be observed in everyday life with sirens on ambulances or police cars. As the vehicle approaches, the sound waves are compressed, resulting in a higher frequency and a higher pitch. As the vehicle moves away, the sound waves are stretched, resulting in a lower frequency and a lower pitch.</p> Signup and view all the answers

<p>Redshift indicates that all galaxies are moving away from us. This observation supports the concept of an expanding universe, where everything is moving away from everything else.</p> Signup and view all the answers

<p>The main cause of the expansion of the universe is the Big Bang, which occurred approximately 13.8 billion years ago. The Big Bang was a rapid expansion of all matter and energy from a point of singularity, resulting in the formation of the universe.</p> Signup and view all the answers

<p>During star formation, cooling allows chemical bonds to bind atoms into molecules, forming nebulae. Denser areas with more gravitational pull attract matter, leading to the formation of a disk that rotates around an axis. The center of this disk becomes hot enough to glow, creating the first protostar.</p> Signup and view all the answers

<p>As a protostar continues to grow, matter is continuously pulled in due to gravity. This leads to an increase in temperature and density until fusion reactions occur. Fusion reactions generate helium, which ignites the star and marks its transition from a protostar to a main sequence star.</p> Signup and view all the answers

<p>The estimated age of the universe is approximately 13.8 billion years.</p> Signup and view all the answers