Meaning: 'Substance' refers to a particular kind of matter with uniform properties, in this case, indicating the mysterious material that makes up Dark Energy.

Wrong options:

• budget: 'Budget' refers to a financial plan and does not relate to the physical composition of the Universe, making it contextually irrelevant.
• track: 'Track' implies a path or course and does not fit the context of describing a material or component of the Universe.
• landing: 'Landing' refers to the act of arriving on the ground, which is unrelated to the concept of a material that constitutes the Universe.

Correct answer: detected

Explanation: The verb 'detected' is appropriate here as it indicates the ability to discover or identify something, which fits the context of finding Cold Dark Matter through its gravitational effects. It is the only option that correctly conveys the action of discovering something that is not visible.

Meaning: 'Detected' means to discover or identify the presence of something, particularly something that is not immediately visible or obvious.

Wrong options:

• replaced: 'Replaced' implies substitution, which does not fit the context of identifying or discovering something that is not visible.
• glanced: 'Glanced' suggests a brief look, which does not convey the action of discovering or identifying something scientifically.
• attested: 'Attested' means to provide evidence or proof, which does not accurately describe the process of discovering something like Cold Dark Matter.

Correct answer: discoveries

Explanation: The noun 'discoveries' fits well as it refers to findings or revelations in science, aligning with the context of new understandings in the field of cosmology. It is the only option that accurately describes the significant findings related to Dark Energy and Cold Dark Matter.

Meaning: 'Discoveries' refers to the act of finding or learning something new, particularly in a scientific context.

Wrong options:

• inventions: 'Inventions' refers to the creation of something new, which does not fit the context of scientific findings or revelations.
• carriers: 'Carriers' implies something that transports or holds something else, which is not relevant to the context of scientific findings.
• areas: 'Areas' refers to regions or sections, which does not convey the concept of scientific findings or revelations.

Correct answer: revelation

Explanation: The noun 'revelation' is suitable as it signifies a surprising and previously unknown fact, which aligns with the context of Copernicus' significant contribution to astronomy. It is the only option that conveys the idea of a profound realization in the scientific community.

Meaning: 'Revelation' means a surprising and previously unknown fact that has been disclosed, particularly in a scientific context.

Wrong options:

• realising: 'Realising' is a verb and does not fit grammatically as a noun in this context.
• taking: 'Taking' is a gerund that does not convey the intended meaning of a significant discovery or realization in this context.
• bringing: 'Bringing' is also a gerund that does not fit the context of describing a significant scientific realization.

Correct answer: summarise

Explanation: The verb 'summarise' is appropriate as it indicates the action of providing a concise overview of information, which fits the context of the lecture's purpose. It is the only option that accurately describes the intent to present the current evidence for Dark Energy.

Meaning: 'Summarise' means to give a brief statement of the main points of something, particularly in a lecture or presentation context.

Wrong options:

• state: 'State' implies declaring something, which does not convey the intent of providing a concise overview of information.
• describe: 'Describe' suggests detailing something, which is broader than the intent to provide a summary.
• fortell: 'Fortell' means to predict or prophesy, which does not fit the context of reviewing current evidence.