Stars And The Universe Continued
Muhtasari
The Sun is just one ordinary star among hundreds of billions in our galaxy, the Milky Way, and the Milky Way is just one galaxy among billions in the Universe. Across these vast distances, measured in light-years, stars are born, shine for ages, and die in spectacular ways.
In this lesson you will learn how galaxies, stars and the Milky Way fit together, what a light-year is and its value in metres, and the full life cycle of a star from a cloud of gas to a white dwarf, neutron star or black hole. You will see how the death of one star seeds the birth of the next.
Malengo
- State that: (a) galaxies are each made up of many billions of stars (b) the Sun is a star in the galaxy known as the Milky Way (c) other stars that make up the Milky Way are much further away from the Earth than the Sun is from the Earth (d) astronomical distances can be measured in light-years, where one light-year is the distance travelled in (the vacuum of) space by light in one year
- [Supplement] Know that one light-year is equal to 9.5 × 1015 m
- [Supplement] Describe the life cycle of a star: (a) a star is formed from interstellar clouds of gas and dust that contain hydrogen (b) a protostar is an interstellar cloud collapsing and increasing in temperature as a result of its internal gravitational attraction (c) a protostar becomes a stable star when the inward force of gravitational attraction is balanced by an outward force due to the high temperature in the centre of the star (d) all stars eventually run out of hydrogen as fuel for the nuclear reaction (e) most stars expand to form red giants and more massive stars expand to form red supergiants when most of the hydrogen in the centre of the star has been converted to helium (f) a red giant from a less massive star forms a planetary nebula with a white dwarf star at its centre (g) a red supergiant explodes as a supernova, forming a nebula containing hydrogen and new heavier elements, leaving behind a neutron star or a black hole at its centre (h) the nebula from a supernova may form new stars with orbiting planets
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Stars And The Universe Continued. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- The Sun is a star in the galaxy known as the: A. Andromeda B. Milky Way C. Solar System D. Orion Answer: B
- One light-year is equal to: A. 9.5 x 10^12 m B. 9.5 x 10^15 m C. 3.0 x 10^8 m D. 365 m Answer: B
- A star much more massive than the Sun ends its life as a supernova, leaving behind a: A. white dwarf B. planetary nebula C. neutron star or black hole D. protostar Answer: C
- A stable star is one in which gravity is balanced by: A. the magnetic field B. the outward push from its high core temperature C. the solar wind D. nothing Answer: B
- A star 2.0 light-years away is a distance in metres of about: A. 1.9 x 10^16 m B. 4.75 x 10^15 m C. 9.5 x 10^15 m D. 2.0 m Answer: A
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Stars And The Universe Continued? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
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