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Let’s go through each question one by one. I’ll explain what each is asking and give you the correct answer based on basic science facts (especially about space, stars, planets, and astrology vs astronomy).

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A1. We search for living things among the stars, and we call this study ______.

→ This is called astrobiology — it’s the study of life in the universe.

✔ Answer: astrobiology

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A2. There are over ______ billion stars in our galaxy alone.

→ Our galaxy, the Milky Way, has between 100 to 400 billion stars. Most textbooks say “over 100 billion.”

✔ Answer: 100

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A3. We can’t use a rocket to take us to the stars because the stars are too ______ / far away.

→ The word given in parentheses is “distantly spaced” or “far away.” Either works, but since they wrote “(distantly spaced / far away)”, pick the simpler one.

✔ Answer: far away

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A4. The rover was loaded with instruments that helped us look at Martian ______ from earth, and examine them for signs of water or evidence of Martian life.

→ Rovers like Curiosity or Perseverance analyze soil or rock samples. But the blank says “Martian ___ from earth” — actually, rovers are ON Mars, not viewed from Earth. Wait — maybe it means “Martian soil/rocks” that we study via data sent back.

But looking at context: “look at Martian ___ from earth” — probably meant “data” or “images”? Hmm. Actually, common phrasing: “examine Martian soil” or “surface”.

Wait — perhaps it’s samples? But rovers don’t send physical samples back yet (except future missions). Maybe it’s data?

Actually, let’s think: NASA rovers send back images and chemical analysis of soil and rocks.

Best fit: soil

✔ Answer: soil

*(Note: If your video said something else, go with that — but scientifically, “soil” or “rock” fits.)*

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A5. ______ / Extremophiles are organisms that live in hostile environments.

→ The term is Extremophiles — already given! So just write that.

✔ Answer: Extremophiles

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A6. The closest neighbor to earth is Mars, nicknamed the ______ planet.

→ Mars is called the Red Planet because of its rusty color.

✔ Answer: Red

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A7. There is good evidence that, at one time, ______ held a lot of water on its surface.

→ Again, Mars — scientists believe Mars once had rivers, lakes, even oceans.

✔ Answer: Mars

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A8. Acids and ______ usually react when combined, but without water, there’s no way for electrical ions to form from one atom to another.

→ Acids react with bases. That’s basic chemistry.

✔ Answer: bases

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A9. We should look for planets that contain ______ if we want to search for other life forms.

→ Life as we know it needs water. So we look for planets with water.

✔ Answer: water

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A10. The ______ coming off from the surface of a star is so intense, it incinerates molecules.

→ Stars emit radiation — especially UV and X-rays — which can break apart molecules.

✔ Answer: radiation

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A11. Astronomers have found that the biggest ______ (gas) planets orbiting other stars...

→ Big gas planets are called Jovian planets (like Jupiter), or sometimes “gas giants”. But the blank says “biggest ___ (gas)” — likely gas giant.

Wait — the sentence continues: “...orbiting other stars.” These are often called exoplanets, but specifically big gas ones are gas giants.

But the hint says “(gas)” — so probably gas giant.

✔ Answer: gas giant

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A12. In 1995, Swiss astronomers detected a planet orbiting a star much like our sun.

→ This is a statement — no blank. Just confirming fact. No answer needed here.

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A13. As an object moves closer to you, its sound is higher pitched explained by the ______ Effect.

→ This is the Doppler Effect — same reason ambulance sirens change pitch as they pass you.

✔ Answer: Doppler

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A14. Stars wobble when planets pull them evenly, which occurs with planets ______.

→ When a planet orbits a star, it pulls the star slightly — causing a “wobble”. This happens when planets are orbiting the star.

But the blank might be looking for in orbit or around the star.

Wait — maybe massive? Or close? Actually, the wobble is caused by gravitational pull — so any planet causes it, but bigger/closest cause more noticeable wobble.

But the sentence says: “which occurs with planets ______.” Probably orbiting.

Alternatively, maybe present? Not sure.

Looking at common phrasing: “Stars wobble due to the gravity of orbiting planets.”

So best fit: orbiting

✔ Answer: orbiting

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A15. The second Mars rover found small pebbles which appeared to be composed of quartz / basalt, which forms in water.

→ Quartz can form in water, but basalt is volcanic rock — doesn’t require water. However, some minerals like hematite or clay form in water.

Wait — actual mission: Opportunity rover found hematite spheres (“blueberries”) that formed in water. But the question says “quartz / basalt”.

Quartz *can* form in water (like in veins), but basalt is igneous.

Actually, the rover found sedimentary rocks and minerals that form in water — like sulfates or clays.

But between quartz and basalt — quartz is more associated with water-formed deposits (like sandstone).

Wait — correction: Basalt is volcanic, forms from lava. Quartz can form in hydrothermal vents or sedimentary settings.

But NASA found silica-rich deposits (which include quartz) that suggest hot springs — so water-related.

However, the most famous water-related mineral found was hematite, not listed.

Given choices: quartz is better than basalt for water formation.

✔ Answer: quartz

*(Note: Some sources say the pebbles were rounded by water flow — composition may vary, but quartz is plausible.)*

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Now, let’s compile all answers:

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Final Answer:

A1. astrobiology
A2. 100
A3. far away
A4. soil
A5. Extremophiles
A6. Red
A7. Mars
A8. bases
A9. water
A10. radiation
A11. gas giant
A13. Doppler
A14. orbiting
A15. quartz